This is very cute, I played it from start to finish a few times. It's quite short so I'll be limited with my feedback:
I think that if there were like 5 levels (shorter than this one big level), the game would have felt more complete (even a longer level with checkpoints would be ok). I say this mostly because the game itself was quite enjoyable (many games overstate their welcome, but I think that this one would have benefited from some extra content).
Anyway, good job and good luck :)