I absolutely loved the mechanic and the levels I was able to do made pretty good use of it. Unfortunately it's also really buggy. Here's the list of bugs I ran into: the hitboxes are wider than the character, the character sometimes slides after a jump (independent of how he's moving), if you land before the falling animation completes he stays in the falling animation, and on one of the levels the key disappeared so I was unable to progress. Still one of the better "designed" games I've seen; just needs a little more love before it feels good to play.