Not only were the basic movement controls really sharp, for the most part (come on, why isn't the spacebar jump) it was just generally fun to play and funny to witness what would happen in the next level. Though, I really wish there were more levels. Also, there is a major problem. If you keep tapping the jump button, you don't stop going up. It can make a couple levels too easy.
Anyway, the game was really good. With some nice music and more levels, I think you would have an incredibly enjoyable game!