The puzzle mechanics are nice, although I had to find the solutions more by accident then by understanding what to do. I didn't manage to solve all levels. Also the jumping could be kind of slower. It's a bit to "aggressive".
I really liked the graphics of your game. Also the music is pretty cool. Sadly, somewhere in level 4 or 5 an error occured. A turtle clipped through the ground and at the same moment, the music died and I had no more sound.