Hey, great little game! It looks really good, and the music is delightful. What engine/framework did you use?
Some constructive feedback: the controls felt slow. A few times I'd solved the puzzle in my head, and then it would take forever to bounce oily to where I wanted him to go (or I'd make a mistake and dread having to repeat the moves I already made). Speeding it up a little might improve the game-feel.