I'll start with what I liked. The visuals, the game looks really good, I played it on the max settings from the drop down list at 1440p, and everything looked great. The atmosphere is also a strong point here, from the get go I didn't feel safe wandering around the house, and that was only elevated by the changes to the environment, it also helps that a lot of the sounds used were excellent. I also loved the attention to detail in some of the environments, particularly the dark room, and the living room. The story overall seems interesting, and I could somewhat piece together what was happening, though a little more context wouldn't hurt.
I'll now go over a few things I didn't like. The lack of voice acting is definitely a hindrance, I understand that that's not really a fair complaint but it really would go a long way. The game's performance at times was wonky, I'm 99% certain it's related to my choice of graphics and resolution, so this is a very minor thing.
All in all this is a solid demo. As a horror game it is great, visuals and atmosphere are nailed and the little details in the environments are certainly appreciated. Just throw some voice acting into the mix and I think you'll have a very well rounded package here.
I hope you don't mind but I made a let's play of my time with the demo.
Cheers and best wishes,