It's finally out on the PS3, and I bought it off PSN today. I wasn't sure if I was going to like it, because the PC demo didn't really grab me. However, I've now played through 5 levels in one sitting and I had a really good time with the game. It looks fantastic, the framerate seems pretty close to flawless, the graphics are beautiful (basically looks like the highest detail setting I could get on my PC, except my humble PC - which has a 4350 gpu probably half the speed of the RSX - then probably ran at 10fps or less), and the levels are well designed.
The game is simply a lot of fun, and the controls - for me at least - are a lot better than they were with the mouse/keyboard. It was quite a revelation - suddenly I was playing a proper platformer again.
And it is indeed clear that there are a fair number of problems that you can solve in different ways. I've heard from several people on podcasts that the final level sucks, but everything up to that point is bliss.
I've heard a few people compare this to Shadow Complex on XBLA, and I can certainly see where that is coming from (there's even swimming in both of these games
). Still, where Shadow Complex really didn't click with me, this definitely does. The three different characters you can switch between are really different indeed, and are all very fun to play with. It has most of the trappings of a decent platformer, with a Braid-like thinking aspect to it, but then replace time with physics.
The skeletons that form the brunt of the enemies are nicely done in that they have nice animation in jumping down and climbing up stuff and are fairly dedicated to get to where you are.
I could go into a lot more detail about what the characters can do and how the levels are designed and setup, but I think that if you suspect you might like this game, you're probably going to and are pretty safe to buy it. Oh, and it has local co-op too.