Tripwire Interactive has released a new Killing Floor game, and it's probably not what you'd expect. Called Killing Floor: Calamity, the game departs from Killing Floor's established (and kind of gross) monster-murdering formula, trading a first-person perspective for overhead arcade action.

Another unexpected shift, while the original Killing Floor is a PC, Mac and Linux game, Calamity is an Ouya exclusive. Killing Floor: Calamity offers couch co-op for two players, lots of weapons, plenty of upgradeable perks, nine maps and, of course, hordes of nasty zombie things to slaughter.

The free trial version offers one map, and the full game can be purchased for $15.