Like a lot around here said, at certain point it was harder to lose than to keep going, so at least a quit button would have been nice... additionally when playing not on full screen you can't see the timer, so for my first run thought I was gathering points instead of time and didn't get why I lost :P
Other than that the visuals were charming and the sound was fun to listen to. I played so much my vision started drifting after I closed it XD