Reloaded version of classic Doom: not a clone of the original game, but interesting in his own way.
Arrow keys to move. Keys < and > to move on the scene to left/right. Use the Q/A keys to look up/down respectively and the W key to center the aim. The number keys 1-2-3-4 to switch weapon, and the space bar to execute actions. X key to shoot. M key to toggle sound.