o.o wah... @_@
Some of the complaints I've seen here are either by newbs or people completly forgetting a 16 year old made this! No doubt you kinda put your social life on hold to finish this but it's an amasing acheivement regardless!
Also having never played the games these are based on I'm ashamed to admit I played through most of this, but there are few games that can get me to do that any more even the ones made by professional companies so you've at the very least done a half decent job.
Arguebly some characters do too much damage as others have alreayd said but here are some other possible bugs I noticed.
Samus' machine gun attacks, if the attack misses for some reason the shooting animation suddenly becomes part of the characters collition detection, meaning you can take damge by someone hitting the spray of bullets!
knuckles ftw! Try playing keep away then spamming his rock throwing on FFA matches and you'll see what I mean... AI falls for it every time
blade and blue for some reason their 'up and attack' move has a chance of sending their opponent flying either left or right once the attacked have about 50% or higher dmg
Can't think of any more brain is semi fried for playing too long ^^; truly awesome stuff here consider this at least version 1 of a flash classic! Because any more work on this game would be like updating a commercial game!