Nice game! Very well designed and a funny character.
I have played a few levels and in the third level (maybe one later) in the first world there is a elevator platform at the start of the level. The first time I jumped over the wall and I fell through the platform and died. Second time I waited for the wall to lower and walked onto the platform, but the character was falling into the platform as it went up (didn't fall through it, but it kept jumping in and out). It looked funny, but there is a problem with the collision detection.
But as far as I played, I like it very much there are a lot of different worlds that will keep the player hooked.
Greetz, Sjoerd