Time to play some debbie downer to this thread. I uninstalled the game on my PC (bought it when it was $10 on amazon after seeing the universal praise) halfway through Chapter 2 tonight. My take-while the game certainly has some pretty visuals and music, the actual gameplay feels like I headed over to Kongregate and played one of the many physics-based Flash games there. You build constructs like bridges and towers in varying angles and degrees, get from point A to point B, then do it again.
Certainly the counter argument to this is that the level design transcends that simple play, but when the levels I played are put under the microscope of this and judged for their mechanics, I just didn't see that materialize the game elevate itself in any way out of its genre. The game quickly wore out its welcome just about halfway in (two hours or so worth of play), there's just no meat to the core mechanics, and the game keeps relying on it's aesthetics and clumsy art house vibe.
Note that this game is a five-star game for a lot of gamers. I just found it to be a boring, fairly banal puzzler that is more flash ( pun intended ) than substance.
sort of a 2 star out of five game. Note that I'm not a hater of puzzle games by any means-I play a ton of casual puzzle stuff all the time, both stuff I've purchased and flash games on the web. This one just doesn't jump out at me as being novel in any way outside of the aesthetics.
edit: also I hate puppies, kittens, and I'm just bitter because the game can't be easily reduced to equations on a spreadsheet. or something.