I might add an option to spawn more enemies. Especially that they could be dropped, use some extra elevators etc. Or just spawn behind the corner.
With that feeling that you control a robot, you are quite close to what is actually happening in the game's world.
I used to be afraid of heights. When playing in VR I don't feel anything, no discomfort, nothing. But then, after many hours in VR I noticed that I am in fact a little bit less afraid of heights. It's now just minor discomfort ;)