Well, I like this. Your little guy's got some character. The blue leg in the run cycle is a little odd, it looks like it just jumps from the very back to the very front, I'm not on my own computer and I've got no graphics editing programs here but I would guess moving the passing position of the right foot forward slightly would help the transition from the back to the front. I also don't think you really need to shade the black, it looks fine as it is IMHO. The rounded floating platforms look good, but I would put him in front of them, instead of behind them.