for PSP and playing with buttons only

Chapter 1. Giant Buddha, obviously. Not a horrible boss, but not good either. The little yard outside the house (just past the bridge) has infinite essence for UT spam while you fight. Don't need to get a key from a chest in order to unlock the elevator door, it just opens automatically. After you kill the Rasetsu the Giant Buddha comes back for revenge.

Chapter 2. Dogs are pushovers now. Nerfed flying swallow, I don't think the gray ones even threw any IS at me, and they have lower health. No more IS for Ryu. Additional bow fight right before the Rasetsu mid-boss.

Chapter 3. Vigoorian Flails are now inside of a chest at the start of the chapter. It felt like this chapter was missing a ton of enemies, but I haven't played Warrior on NG2 in a long time so I'm not sure. I tried to UT Gigadeath with the Lunar and it did no damage; could be because I didn't hit him in his head, but he may be invincible to regular attacks now, dunno. His ghost fish are pretty easy to dodge now, if you can't kill them in time.

Chapter 4. Enma's Fang replaces the giant Xbox logo that refills your health. Alexei doesn't go into berzerk mode any more (not sure if he ever did on Warrior), and he seems to spam his jump->ground pound like there's no tomorrow. Statue of Liberty fight after you kill Alexei; it sucks. It's basically Giant Buddha with lightning AoE when she smacks the ground, giant lightning balls coming out of the sky and shooting the bow at her neck.

Chapter 5. No Kusari-Gama on this level any more. You get something else instead, I can't remember what. The Spear Gun isn't in the game anymore either. You get the Howling Cannon on this level I believe, and it's essentially just a replacement for the bow UT for bosses. Werewolves no longer throw body parts as far as I can tell. The ghost fish colosseum is changed a bit. They removed the graphic that has a bunch of fake ghost fish flying around in the background. No ghost fish spawn until you stand on the platform that you fight the water dragon on. After you're done killing off the ghost fish, you fight the water dragon (don't need to pick up a key any more). The area you fight the water dragon on is a bit larger, giving you more room to dodge his attacks. He doesn't dive into the water and jump out any more and once in a while he'll send a bunch of ghost fish to attack you. Other than that he's pretty much the same.

Chapter 6. Bone Boss is pretty much unchanged as far as I can tell. You just fight him alone, you don't have to deal with a bunch of his skeleton minions, but again I can't remember if that was in Warrior in NG2. Seems like Volf blocks flying swallow more often now, but I didn't really try it too many times.

Chapter 7. Mostly unchanged IIRC. Since you no longer have IS, you have to actually fight the flaming armadillo now, which is still terrible.

Chapter 8. Rocket Ninjas remain, but they seem to fire less often. For some reason they spawn two dino-mechs right before the turrets outside of the gate, which is annoying. Can't remember if that was there in Warrior on the original.

Chapter 9. No more jellyfish. There were a few changes to the level design here. The firing range is still there, but they changed some of the structures a bit. I have no idea why. You don't fight the robots any more after clearing out the rocket ninjas, you just go along the path to get behind the gate and swim into the next area. Red fish are still there, but you can kill them in two shots with the hand cannon while standing on land, so they're not any trouble. After you kill that giant wave of beetles, you just drop into the next area where the save point is - the entire tunnel section was cut. New dragon boss is absolutely awful.

Chapter 10. Mostly unchanged? Still gotta fight a bunch of enemies on the staircase, but they come in smaller groups.

Chapter 11. Biggest change here is you fight the Tengu Brothers (or whatever they are) a couple times. Once in front of a few houses and again towards the end, when you're running across the giant field heading towards the Genshin fight. No more windmill shuriken.

Chapter 12. Double Armadillo fight replaced with Marbus. He's a lot more fun when you have a decent character to fight him with. Zedonius still summons a few Red Gajas every 25%, so he's still incredibly annoying. Volf doesn't spawn until you clear out all the horsemen. I didn't fight any red dragons throughout the game either, so I'll assume they're saving them for higher difficulties.

Chapter 13. The little sacks that contain enemies are still there, but most of them are empty. Only one of them has a Rasetsu (a red one for once) and it's the final one. There's no mini-dragons you have to kill any more either, you can just move on to Alexei after you clear that area.

Chapter 14. There's a bridge now in the area that has all the red eels, so you can just stand at the edge and kill them all quickly with the Howling Cannon. After you kill Genshin/Elizebet and take the portal, you're moved to a giant red room (similar to the previous areas) where you have to kill a bunch of ninjas before you move on. There are a few new ninja types in here and they seem to have a couple new moves, but I wasn't really paying attention because the Tonfa ET/UT still rapes any human with ease. That area seems to replace the tunnel that had all the Van Gelfs leading up to Dagra Dai. On that note, Dagra Dai is still awful and he still summons Van Gelfs every once in a while. His attacks were easier to dodge however. Archfiend Stage 1 is pretty much the same. Archfiend Stage 2 was a little easier. When he lands on the ground and starts walking around, it doesn't hurt you any more so you can go ahead and get some free damage on him. edit: actually, maybe he does still hurt you when he walks on the land, but he never hit me so I can't say for sure.

There's a chapter for Ayana/Momiji/Rachel but I can't remember exactly where they were. Momiji's chapter was decent and so is the character I think. Her boss is the Tengu Brothers, and they're a pretty decent boss fight. Rachel's level is AWFUL and so is the character, and the boss for her stage is (Marbus) awful when playing as Rachel. Ayane's stage was decent, I suppose. The boss of her stage is piss easy. Still not a fan of Ayane, but I'd play her 500 times over playing Rachel once.

Fiend Ryu

3 different hair styles for Rachel, the NG1 outfit for Ayane and a white ninja costume for Momiji.