Descent

Use W,A,S and D to move, left mouse button to fire and R to reload. The L-Complex: origin unknown. Documented to be a series of underground mazes, many people have tried to investigate them to no avail. Rumors of infestation by demons and recorded sightings of unearthly monsters have confirmed this area to be a death trap. Now you must descend into the depth with only your gun for comfort. Will you unlock a secret hidden between the corpses, or will you succumb to the inevitable hordes of gnashing teeth to become yet another stain on the wall?

Screenshots from Chrome Web Store