A few things: there's a weird glitch where it says full screen is on when it's not, and vice versa. Second it would be nice to scroll through weapons with the wheel and not just the number pad, third I would personally like to see the inventory have more interaction (i.e. see what the names of things are when you hover over them and other things like mini item descriptions or whatnot).
With that being said, this is a really good game, your pacing is fantastic. Not a whole bunch of weird stuff is thrown in your face at once, it's all done so masterfully. You've avoided the pitfall of jumpscares, and you've made something that is genuinely frightening, great job, not even many full fledged developers nail horror this well.
I can't wait to see the final product and I would seriously pay $10 for the game if this is the level of quality just from a demo. Keep it up man.