In Warhammer 40,000 Space Marine you are Captain Titus, a Space Marine of the Ultramarines chapter and a seasoned veteran of countless battles.
A millions-strong Ork horde has invaded an Imperial Forge World, one of the planet-sized factories where the war machines for humanity’s never ending battle for survival are created. Losing this planet is not an option and be aware of the far more evil threat lurking large in the shadows of this world.
Cannot be run due to DRM. ProtonDB / Github
There may be a workaround (posted for AvP)