It is a fine week for PC game releases. As well as Bit.Trip Runner we have Trion's glossy MMO Rift arriving today, and at last the chaotic local multiplayer minigame collection B.U.T.T.O.N. (Brutally Unfair Tactics Totally OK Now) is also available for download. Described as a party game, it's also very close to a literal fighting game. I witnessed a collective of RPS contributors warring over it at the EG expo last year, which resulted in the likes of Kieron, Quinns and LewieP quickly devolving from curious onlookers to a mass of flailing limbs, crushed spectacles and guttural screaming. The video below demonstrates how it goes, but picture it with ungainly bespectacled men and you'll have some sense of the true wonder/horror of this keyboard-mangler.
They're all so polite! You probably won't be. You'll almost definitely punch someone in the nose, in fact. I know I would.
BU.T.T.O.N. is incredibly cheap - just a couple of dollars/pounds - and is available direct from the Danish devs, or via Steam. I rather suspect that this is one game that will work rather well with the latter's impending TV mode.
Also, you can totally play it on a boat:
More videos and mini-game descriptions over yonder.