So anyway, you have to clear each level of aliens using a variety of weapons whilst staying alive (not easy later on). It's a manic isometric shoot 'em up for PCs set in an alien infested military base and it's right up my street.
It's clear that Alien Shooter, by Sigma-Team, has been influenced by many games but that's fine, because it was influenced by *great* games like: Gauntlet, Alien Breed, Diablo, Doom, Serious Sam etc.