How to bring some horror back
How about if you have to do a thing that would normally be an body exercises, like much running, such ducking, jumping or making this tea bagging things. Normally it would be hard to do it for a long time, so in the real world your heart would beat faster and heavier. Suggestion: Why don't you put that in the game? Make the heartbeat to start if the surv is running or those things for a long time, or often in a short row.
Comments
Dont know if it is a good idea or not. Another idea can be also make crouch/uncrouch slower.
I don't know if it will make the game scarier. I think the only way to make the game scarier is to do what solo horror games do- plenty of gore(which, by the way, should be mode that can be turned on and off) more darkness, and maybe a move to first person view.