The Citadel

A gory FPS inspired by Doom, where you do battle with hordes of enemies in an apocalyptic future that combines a manga and H.R. Giger (the man behind the design of Alien) aesthetic. Expect fierce combat, plenty of blood, and omnipresent violence. The recoil on the weapons makes it a brutally immersive game. The gore can be turned off for a slightly gentler experience. One for grown-ups.