Foul Play is a Side-scrolling Brawler being developed by Mediatonic who are no newcomer to the indie scene, having developed Amatuer Surgeon and Robot Unicorn Attack Evolution, among others.
Uniquely — or at least so far as I have seen — Foul Play takes place on a stage. This is no rhythm game like your Guitar Hero or Rock Band, this is a Side-scrolling Brawler in which you are like actors on a stage, playing out the life-story of daemon-hunter Dashford. The mysterious life of Baron Dashford, Saviour of London, will be revelead on the stage. Complete with 22 differing acts, 50+ enemies and local/online co-op, Foul Play is one to watch.
Foul Play can be pre-ordered at this page via the Humble Store: http://mediatonicgames.com/games/foul-play