Fun and simple concept. I don't think the theme is too strong with it, but it is there. And the gameplay is good enough to be interesting. I do think it could have been more if there was a bit of a variance between speeds (i.e. the further you are on one side of the barrel, the faster you go) because right now it's a jarring switch between directions when you, well, change directions. I had fun though, so good job either way.