BROFORCE

I backed the original crowd funding on this and have been playing it some time. So I can vouch for it's every-penny worthiness, even in Early Access @ $15.

Link


It's every bit as fun as it looks, has 4 player multiplayer, map editing and sharing.
Steam link: http://www.youtube.com/watch?v=qAlQx-kOjOE
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Advocating the end of the world since July 1995.

Also, it is recommended you break out a gamepad for it. Xbox controllers are natively supported. But any controller can be used so long as it shows up as a game controller in Windows. All keys are rebindable, be it a gamepad or the keyboard, but as with any platformer, keyboards are a bit clunky.
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Advocating the end of the world since July 1995.