Nice!
The controls need some work...it would be great if you could change positions like the opponents did and fix it so that the right fist isn't used as much(make it so you could control both fists). The block feature could use some fix ups as well: for Britney, the block button heals her, and for Barney the block button heals you(which is sorta good thing); even though it works for Tyson, it's pretty hard to predict his attacks.
However, the animation was great, the art was decent, and it was funny (the faces of your opponents when you hit them, the fact that you could kill them)