I played through the demo.
The game is very oppressive, and the more you advance the more it is, that's great. It's just as slow as it has to be, I like the enemies especially the two other kinds than the regular zombie kind and the lighting hazard is super fun to deal with and atmospheric. I think you also get the perfect amount of ammo and the speed of the enemies is appropriate.
I like the option to enable or disable the filter, I don't even specially mind either way myself yet I still think it's the right thing to do.
It's weird that the selected item is the one which is not highlighted, it's no big deal in the end but it confused me for longer that I'd like to admit.