This is one of the most interesting games I've played in a while. It a side scroller and a very well done one that reminds me of the original 2d side scroller
Prince of Persia. The whole thing is done in black and white yet the backgrounds have a surprising amount of detail. Puzzles are primarily physics based and are rather challenging. Probably the most unusual aspect is the fact that you simply wake up in the game with no story and no instructions, but it quickly becomes clear that you must get moving.
http://ps3.ign.com/articles/118/1182914p1.html
If you've played and like some of the more unique games on PSN like flOw, Flower or Echochrome, then this one should be on your list to check out as well. The demo is available on PSN free; to unlock the whole thing is $15. Most PSN games don't seem worth that, but I couldn't resist after playing the demo and it is totally worth it. Highly recommended.