Pros and cons are down below) Check out my vid here (likes and subs are highly appreciated)):
Advantages:
1. Near the end the game got scary! It was very cool to see an actual enemy as I didn't expect to meet one.
2. The ambiance is very cool and I love those bits of story that we got to see in the demo from the newspaper, paintings, and environment. Clearly, a lot of thought was put into the story which makes it promising for the full game.
3. I really liked the pacing especially the spooks in the room with the soldier. I think that was done marvelously!
Disadvantages:
1. I think the game would benefit a lot from having options to read texts normally (like to press a button and then you see what's written on a paper but you don't have to turn the paper constantly and adjust angles which were pretty annoying).
2. The paintings didn't match the environment at all. Sometimes these paintings are very well done or a bit funky but creepy. These were neither so I didn't really like it. Though, the one with the soldier in a room when the enemy could be seen for the first time was very good. Maybe it would be nice to add a bit more color and get make them a bit crazier (a bit messier instead of "clean lines"). Though I don't really know what you were going for, I'm just telling you my personal opinion.
Overall:
It was a great demo which made the game seem promising and interesting. I'll check out your game on steam) Keep up the great work!)
Hope my feedback was useful!