Note: I haven't played this yet
Constant C looks like a rather interesting puzzle platformer. I played the android version (which sadly doesn't exist anymore) a while back.
The gist is this: time is frozen and you have to solve this. Time only flows in a certain sphere around your character, which means things only move when you get close to them and stop moving when you get away from them. An interesting aspect is that objects do retain their momentum even when frozen in time, so when you get close again to a falling box it will restart moving with the velocity it had.
If that wasn't enough, you can also switch the direction of gravity in any of the four main direction at any point in time.
The android version was quite fun to play (it did the gravity switching by physically rotating your device which was rather neat) so I'm looking forward to trying this out sometime.
