As a space marine who crash landed on a planet inhabited by cavemen, use your weaponry to shoot 'em all up. Throw grenades to demolish buildings and constructions along with goblins, orcs and trolls, and upgrade your weapons up to a nuclear bomb.
Use the W A S D keys to move. Use the mouse to aim and shoot. Press 1 & 2 to change weapon. Press 3 for grenade. Press Spacebar to pick up weapon.