Well done.
It may be a Smash Bros. ripoff, but it is a very good one. Who wouldn't want to play a game as popular Newgrounds characters?
But this is a very good game. Crazy combos to pull off, good array of moves to use, different characters with their own pros and cons, and good backgrounds. All the little things were done well, too. Like the menu system and the characters having their own story.
No bugs as far as I've played, and the controls work well. You guys have really outdone yourselves, making this crazy idea for a game eventually coming to life. So yeah, good job, guys.