Finally got it, after like a half hour of trying. I got stuck at the same jump on level 5 for a long time too. XD
My feedback would be to improve the way you do the smaller jumps. I would lightly tap it exactly the same, but it would jump at different heights each time.
Hmm... I can't see any cubes. When I click play, I just see a blank magenta screen, and then I die after a few seconds (I guess because I hit a cube I can't see?).
