I loved the idea and the music was amazing. Very well done on those points. For puzzle design, I think there's two ways of thinking about it, neither of which are wrong. Either you want a very narrow exacting way to play or you loosen up and fudge the physics and reward the thinking part not punish the bad execution. I couldn't get past level 3 but I think I had the right idea. Might be a skill issue on my part though. Still, I found it a bit tough. Even the level 2 bounce took me a few tries.