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It is, or was, a 2D side scrolling action-type game similar to Streets of Rage, Battletoads, something like that. It was released within the last few years, had a dark anime style to it, nice 2D graphics, and it was free. This is all as far as I remember.
Do you know what I'm talking about? Any suggestions are welcome. I can't remember the name, and after not being able to find it with google searches, I'm here.
Edited to add; it is multiplayer, up to 4 players I think.