Just downloaded the Demo of this game off of XBOX Marketplace, and I have to say I'm fucking impressed. I remember seeing something on this awhile ago through Gametrailers, and stumbled upon it today while downloading some SOAD songs.
http://braid-game.com/
The game is just 2D at its best. The graphics have a hand-painted, dreamy, shimmery look to them that is incredibly unique, the writing so far is alil sappy, but if it's your thing, you'll get sucked into it. (read: I did). I've only done the first world, yet I've already been impressed by the uniqueness of a couple of the puzzles. (You'll know what I mean when you figure them out, just so out of the ordinary. The use of time travel both back and forth...is a great perk to the gameplay.) Needless to say I'm buying Microsoft Points right now to unlock the full version. If anyone deserves your money, its the creator of this game. We need to see more innovative titles like this.
XI Wiki


