The concept is excellent, great job! A friend of mine submitted a game to this Game Jam so I tried some of them, this one is really cool! And the art is incredible.
The only default I can see is that the controls aren't immediate in the beginning of a level. That made the last one, with free fall, a little hard to complete, but it's doable. I can totally imagine a longer game with this concept and such incredible art on Steam and in my wishlist :D