This was a blast. I really loved your art styles and the overall mechanics seem to be worked out. And I loved the fact that the game slowed down when you where about to punch the other guy. The only criticism that I have, is that both the CPU and Player look alike, which means I got confused as to where I was write often. Just changing the color of the player/CPU to blue or something, could really help.
Apart from that, you have an awesome game! Congrats! :)