Yeah, OK, it's Robotron with zombies; move around with WASD, aim and shoot with the mouse. Each level throws a swarm of increasingly swift-moving infected at you. Survive and you can spend points on improving character attributes such as Strength, Agility or Luck. You can also spend cash on buying new guns and grenades, as well as upgrading each weapon's range, clip size, accuracy, etc.
The music is terrible though.