This is a good start, but I was struggling with some of the mechanics:
1) Neither the game nor your comments mention the use of the "z" button, even though it's so important to the game. Even the "x" button isn't mentioned except in a tip. I wish the controls had been more straight-forward.
2) Even after slowing down my fall quite a bit, I have trouble making it past the spikes. The game seems more focused on having keen, subtle movements and a little luck over progressing through the game.
3) The sound gets annoying by about the third try. <_<
The game has a good concept, so I'll give you points for that. Keep working on it, and I imagine we'd see some good art come out of this.