The dim vision, close confines and ghosts coming out of the walls made for a nervous feel to gameplay, which was very effective. it made me play with a lot of caution, had flashbacks to the first time going into New Londo in Dark Souls, never knowing when a ghost would ambush you through a wall.
Not sure if I missed something with the controls. I was using wasd, clicking space to fire with the same hand and aiming with mouse, felt like I needed three hands.