NICE!
Nicely done, good solid game... PLEASE make another one...
Personally I think there are a couple things that could be improved though... The characters slide too much, it's too hard to control and it's WAY too easy to knock people out and get knocked out, even on very hard. Soften them up with 1 or 2 hits then just finish them... Some of the characters also have pretty much useless attacks (captain falcon's punch or pikachu's shock). For instance, captain Falcon's punch takes forever to charge up, but you have to be facing them the whole time, and pikachu's shock doesn't have enough distance really...