Enemies with trillions of polygons are all very nice, but sometimes you just want trillions of enemies coming at you instead - and of course, a high velocity chaingun with which to mow them all down. Step forward Alien Shooter, which in the absence of any empirical studies, I'm happy to stake has a higher body count than all the Dooms, Dukes and Gauntlets put together.
It's also a bloody good game with an arsenal of weapons any FPS would be proud of. Dual pistols, the obligatory shotgun, a flamethrower and a rocket launcher are available for purchase between each level as you fight to keep the unending waves of aliens at bay.
You may think the game looks a bit old-hat, but I can assure you the gameplay is anything but. Sadly, what the game does lack is a multiplayer mode - but for this price, Alien Shooter is excellent value even without it.