Playing through this game, my only complaint I can make note of is that most of the obstacles are relatively easy to avoid, even in the standard "hard" mode. I wasn't shooting for the achievements while playing this, but I was doing a casual Let's Play video for it. So for the most part, I'd say the level design needs a bit of work as it doesn't pose much of a challenge. Perhaps if I run through this game in Very Hard mode, maybe I'll find that challenge I'm looking for.
Aside from that, the music is pleasant and the graphics are charming. Controls are pretty tight, giving you pretty good control over the character. If you're planning to do more with this game, please do so. This is a nice little concept that can perhaps expand to an even larger game.
This is my video of the entire playthrough: http://www.youtube.com/watch?v=npfiGqWcmSM