Pretty Cool
I wish you had added more attacks for the different characters, like in SSB Melee, where there were multiple different things each character could do. I did not like the guns where you had to get a powerup to use them, I would have preferred to use them situationally. Also, more characters! How about Joe Zombie and such?
And, balancing, the Samurai was waaaay more powerful then the others. His juggle is insane and his long and fast attacks don't give the opponent a chance. This would have been a place to make ranged attacks situational, since you could have jumped around and shot him rather then run up and melee.
Besides that, great game, beat the whole thing, but had to make it easy for the Convict fight against all 3 of them.