Time for another update... you'll have to excuse me if some of my comments are a little short, there was a hell of a lot to get through.
So here goes on what I've tried that I think might be worth a look. I'm also including a link to the xbox marketplace page for each game so you can see some screenshots, add it to your download queue and see if other people recommended the game. Just click the header for each game to get to the page.
Along Came A Spider (Platformer) - 400 points
I'm struggling to properly describe what this game is. It's a platformer, but the challenge really comes not from jumping, but from mastering swinging on the threads you can hook onto the edges of the platforms. Simple visuals, but really well done. I'd argue it's a little expensive for what it is, but then I haven't really got through a lot of it yet so I may be a little quick to judge.
Arkedo Series - 01 JUMP! (Platformer) - 240 points
Excellent retro style platformer... and I wont really say much more than it's a no brainer if you're a fan of platform games. Give it a try.
Arkedo Series - 03 PIXEL! (Platformer) - 240 points
Top notch art style on this one, quite unique. I must say that I really like the main character too... he seems to really enjoy jumping about (and his meow attack is hilarious).
The little "zoom" sections are a great little touch which serve to break up the platforming sections quite nicely. Another impressive game from Arkedo.
Avatar Wave: Snowball Fight (Action) - 240 points
When I first saw the user ratings on this I was a little sceptical. I was wrong to be, it's a surprisingly polished little game that's a lot of fun to play, expecially in local multiplayer. Nice enough graphics too, and the avatars seem to fit quite well (they stand out like a sore thumb in many games).
Banana Split (Platformer) - 80 points
One of the better platformers on Indie Games, and has a lot of character. It's a little unforgiving though, so don't expect it to be a cakewalk. Bright, colourful graphics, but the animation could have done with a little work. Great value at 80 points.
Beat Hazard (Two Stick Shooter / Music) - 400 points
This is one of the most distintive two stick shooters available on Indie Games. Polished graphics, and a rather unique gameplay element which generates levels based on music on your 360 or media server. Play it with the right music and it's utterly insane, you'll find yourself rushing for the volume up power ups to really get the beat going. You can see examples here:
http://www.youtube.com/watch?v=MC--RFvicNg and here:
http://www.youtube.com/watch?v=MC--RFvicNg . My only real wish is that the developers add an option to let the game completely scan through your media library (no matter how long that takes) because it takes quite a while to manually get each track that you want to play in game.
Carcophony (Puzzle) - 240 Points
A simple puzzle game, but one that gets increasingly challenging. Part strategy, part speed... quite different. Slick presentation.
Cavemen Vs Aliens (Strategy) - 400 points
There's been a lot of effort put into the presentation on this game, which is always a good sign. Starts off simple, but gets tricky quickly as you find yourself trying to hold onto captured territory whilst simultaneously trying to move onwards. The controls are inspired, and once you're used to them you'll be concentrating 100% on your strategy rather than getting tied up with complex commands. Well worth a look.
Dark (Puzzle Platformer) - 80 points
Took me a little while to work out what I was supposed to be doing in this, but after a while it clicked. Well worth sticking with as it's really quite different. Some excellent use of lights and shadowing.
Earth Shaker (Puzzle) - 80 points
Like oldskool games? Like REALLY oldskool games? Ready to have your eyes bleed from the pure awesomeness that's ZX Spectrum graphics? Go and download this and weep tears of pure nostalgia... and then punch the walls in rage when you remember how much less forgiving games used to be.
(I fully expect anyone younger than 25 to be utterly dumbfounded that people used to play games like this!)
Gerbil Physics (Puzzle) - 80 points
I may be wrong, but this appears to be a more polished version of another game. A great deal of the polish seems to have gone into adding gerbils... but that's ok (I kid, pretty much everything is better than the other game, especially graphics). Challenging physics based puzzler, which will have you scratching your head on many of the levels.
Gravity (Puzzle Platformer) - 240 points
I'll say straight off that this could do with a great deal more polish (especially the animations and audio)... but look past the flaws and you've got a fairly interesting gravity based puzzle platformer for a reasonable price.
Headshot 2 (Shooter) - 80 points
Given the name (and the first game) I expected this to be dire... but it was actually a lot of fun. Track the disguised terrorist until you're ready to take them out as precisely as possible. Hard to do it justice by talking about it, give it a blast.
Ikaroids (Two Stick Shooter) - 240 points
A solid example of a two stick shooter, but I've pretty much had my fill of these so I'll leave you to judge for yourself. Graphics are good, and some of the enemies are particularly impressive. Borrows a lot from Geometry Wars and other two stick shooters, but that's in no way a bad thing.
Impossible Game (Platformer) - 80 points
Crazymental. Try and beat it... go on. I challenge you to retain your sanity.
I could barely get anywhere in practice mode, let alone the normal mode.
Invasion Defender (Tower Defense) - 240 points
One of the better examples of tower defense games on Indie Games, and one with some fairly unique features. Reasonable graphics, and fast paced, challenging gameplay. I particularly liked that the enemies aren't just drones that head from one point to another... after a while they'll learn to avoid where your strongest defenses are, meaning that you can't just rely on the standard tactics which get you past most games in this genre.
iRiS 2.0 - Visualizer Studio (Music) - 400 points
Not really my sort of thing, but I had a mess around with it for a while and managed to create a couple of good visualisers. I can imagine that anyone with the slightest bit of artistic talent would make a better job of it than I would. Given the lack of quality visualisers on the 360 this has a place... and as I've now been informed that you can share your visualisers with other owners of the app (assuming XBL Gold etc) then I'm sure you'll be able to get your hands on some good ones.
Johnny Platform Saves Xmas! (Platform) - 240 points
You should already know of Johnny Platform... and if you don't, go and try it, it's great. This is more Johnny Platform, but even better because the levels are now in widescreen rather than narrowvision. As such it's pretty much essential for any platformer fans.
KGB Episode One (FPS) - 240 points
I'll say right off that this is no * insert popular FPS here *... but it is probably the best attempt at one so far on Indie Games. A step in the right direction, and a bit of mindless fun. Just don't expect miracles.
Leave Home (Side Scrolling Shooter) - 240 points
Sylised retro side scrolling shooter... with bonus retro tape loading noises! One of the sharpest and prettiest games on the service, and dynamic difficulty should mean that you're always challenged. Definitely one of the hidden gems.
Missing Reel (Shooter) - 240 points
A very playable, "B Movie" styled co-op shooter. It's not going to win any awards for graphics, but it's enjoyable... even when played with the co-op AI (who will happily steal all the power ups just like a real player would).
Ninja Bros (Puzzle Platformer) - 80 points
Mind bending puzzle platformer with an old school graphical style. Controlling one ninja is fine, two is challenging, three is crazy, four will melt your brain. Well worth a look. On a random note, this seems to use a really strange resolution... which you'll notice when you play it.
Platypus (Side Scrolling Shooter) - 400 points
Side scrolling shooter with claymation graphics and C64 sounds? Sign me up! This put a massive smile on my face and was purchased the second the trial over screen appeared. If you like side scrolling shooters, you need to give this a go.
Powa Volley Classic (Sports) - 80 points
Probably doesn't stand up too well if you're just going to play single player, but local multiplayer is particularly hectic and a lot of fun. Well presented, if not particularly impressive graphically.
RC Racing 360 (Kart Racing) - 400 points
I found this by looking at the IGN recommends section... and after glancing at the user ratings I wondered what IGN had been smoking. However, they've got a point as this is arguably the best looking 3D racing game on the service, and it's got the potential to be a classic little racer... but the controls are basically broken. I'm not sure what happened that the dev(s) didn't notice, but the steering is so unbelievably twitchy so as to make the game almost unplayable. It could be that it's limited only to certain vehicles, but the car I picked was horrible to drive. Still, you may fare better, and it's clear that a lot of effort has been put into the game, so it would be a shame to see it ignored off hand.
Run Away (Platformer) - 80 points
This is basically a flash game, but it had me laughing out loud a couple of times during play and it's a lot of fun. If it doesn't put a smile on your face, you're dead inside.
SFG Soccer (Sports) - 400 points
This is a great little football (no, not soccer, football) game. Captures the fun of the old footy games and adds a pretty good career mode (with RPG elements)... and yes, it has bicycle kicks.
Sidehill Gouger (Puzzle) - 80 points
I'm not entirely sure about the gameplay on this one, but I'm a sucker for any title where the developers have shown that they've put some effort in. To be honest, I don't think I'm the target market as it seems to be a take on a game I'm no fan of... minesweeper. However, that description really doesn't cover it, because in a way it's as much a simple detective game as anything. I really can't describe it... bah, just try it and blame me if you feel like you wasted 10 minutes.
Snake Maze (Maze Game) - 80 points
It's a maze game... but it's a fairly challenging maze game with dynamically generated levels. Starts easy, gets crazy.
Sol Survivor (Tower Defense) - 800 points
One of the DreamBuildPlay 2009 finalists, this is an excellent little tower defense game. Some of the most interesting enemies and defenses I've seen in a tower defense game, and some great multiplayer if you can find someone else with the game to play against (a depressing problem with indie games). Unfortunately 800 points looks pretty steep these days, but it's a great game that's had a lot of love put into it so it's well worth a look. Decent multiplayer commentary vid here:
http://www.youtube.com/watch?v=l_YlUYwar3I
Soul (Action) - 80 points
An extremely pretty game let down by the rather strange decision to try and shock / scare you every couple of minutes with a screamy horror scene (we've all seen the youtube videos of the same ilk). The main problem is that it stops being shocking after the first time and gets steadily more annoying from that point on. It also had me reaching for the mute button, which is a shame because some of the audio in the game is quite good. Supposedly this is being toned down in an update, time will tell. Very, very tricky... requires some extremely precise control of the thumbstick.
Square Off (Shooter) - 240 points
Charming little shooter. Crisp, colourful graphics, impressive animation / effect and solid gameplay. Some of the weapons pack a real punch, and there's a great sense of desperation when you're being rushed by tons of aliens.
Whipcrack (Action) - 240 points
This is another one of those games where my opinion seems to differ from the people rating the games on XBL. I suspect it's because the game start off particularly slowly, and the first few levels are nothing to write home about. It's worth sticking it out though as the game has a lot of character, and some fairly clever gameplay elements. Can take a look at the trailers here:
http://whipcrackgame.com/default.aspx
Wool (Action / Puzzle) - 80 points
I really love this game, and it's probably only partly because I'm Welsh... Gameplay is solid, graphics are good and co-op is tons of fun, as long as you don't end up killing each other when you screw up. A simple premise, executed pretty much flawlessly.
Yet Another Zombie Defense (Shooter) - 80 points
I'll be honest, the graphics on this game are iffy, the interface is iffy, the sounds are iffy and the gameplay is basic... but it grabbed me, and judging by ratings, I'm not the only one. Very simple shooter with some aspects of tower defense. Build your defenses and keep the zombie hordes from snacking on your face for as long as humanly possible.
Your Doodles Are Bugged! (Puzzle) - 80 points
One of my favourite indie games so far. I was initially a little concerned that the pen would be a little difficult to control (it would lend itself naturally to the DS) but its quite functional. Full of character, and really a no brainer at 80 points. I'd really like to see some levels with unlimited ink (Edit - Apparently you get free play once you complete the game), or even the ability to make your own levels... but that's in no way a criticism and it wouldn't be fair to expect that sort of functionality in an Indie Game. My only real criticisms would be that the difficulty curve is pretty steep and that it really needs multiple levels of undo.
Hopefully some people actually read that, or some of it. It took a ludicrous amount of time to do.