Wow, that was slow and uneventful. 2 minutes of walking in dark and darker environments with hardly any sounds/music/ambiance.
-Id add more lighting in areas. You can pull scary scenes out of partially lit rooms more effectively than completely dark ones. Dramatic lighting>No lighting
-Add ambiance, background music, sound effects, something to hear other than...whatever it was you had.
-I didn't see a story or any kind of progression. What is that guy doing out there? Who was that cop? Why was that town apparently abandoned? Have to convey some kind of story to explain some things.
-Use shaders on at least minimal. Gives you much more control over environment and atmosphere. (Fog, Lowangle lighting) This will also fix your brick studs from glowing in the dark.