Rock solid concept, and clever level design! I never felt bored and the challenges followed a balanced progression.
Yes, the controls are a bit slippery, but they also provide an additional layer to interact with the environment while adding some spicy, physics based unpredictability - personally, I found them quite fun after a bit of getting used to.
I'm a huge fan of the cartoonish pixel art / pastel color pallette combo, and that was in fact the reason I checked the game in the first place.
My only (minor) criticism is about the music which, although is well thought in terms of mood and timbre, lacks a strong theme, and therefore becomes a bit repetitive after a while.
This should DEFINITELY become a full game!