Haha this was fun and easy to understand. Good job. love the graphics style.

I'm not sure how it connects to the theme, but the game is pretty fun. A few really small notes are that I think the music in level 3 is louder than the others, and there's a blind jump in level 3 after the two springs in the beginning. Also there's a bug where your jump stops working and changing the text after beating level three from "Game end" to "You win" could make the ending a tiny bit more enjoyable. 

The controls were fun! And the last level took a few trys. Good choice of music as well.