Awesome game! I like the graphics and especially the level design! Couldn't complete all the levels, as it gets quite difficult, but I really liked level number 7 for example :).
It would be great if the game remembered the input for a second maybe, since when you press a button a bit too early, it doesn't get accepted. I think I also found a bug: when you go right in level 3, you fall down even though it's solid ground.