Probably the best fighter game on Newgrounds.
Great game. Tons of awesome power ups, stages, and characters. You won't grow bored quickly, because it's addicting as hell. The only thing bad is that some parts are WAY too hard, like Hank's final stage. What did I fight, 10 waves of enemies before I died? At least make it so they can't grab the power ups, or make them die more easily.