This game is really great. Its a combination of the same formula for many zombie games with a twist. In this game you shoot the zombies to make them un-undead. That is you convert them to your side as allies. There is a catch however if the zombies get you, you become one yourself and now those people you converted are your enemies. Really well done graphically and really nice concept.

Controls
WASD to move
Space use power ups/ lay mines
Mouse aim and shoot