I think a battery for the flashlight and needing the flashlight to stun the monster would be great. I think multiple monsters appearing and disappearing would make it sooo much scarier. The sounds are really scary. A map with an X of where you are at all times would help, as I have no clue where to go to unlock the generator room, and I got completely lost many times. I don't think you should be able to stun the monster through walls. Probably the scariest game so far, only two left to rate (hope I make it in time!).
6.7/10, scawy.