I was absolutely terrified.. Mainly because you've done an absolutely amazing job at the environment and the ambience. The stillness of the empty sounds, the thick dark and shadows that enveloped and stuck to each corner of the rooms; they all really blended together into one great game! (Video below if anyone's interested in watching!)
The recreation of the Edith Finch house was great! Was really fun to go back into that house and reminisce all the stuff that happened in that game. Also really loved the horror and dark tones you've taken on the game! The art was lovely; the outside area really looked like a pleasant painting and the blur and grain of the inside made it seem so similar to the real game yet with a tinge of darkness and spookiness.
The only caveat of this game which was the strength of your demo was that there was no indication of where to go and what to do. If there was, I'm super sorry that I missed it but I kept going in circles before randomly clicking on things and then finding the door upstairs that the player would have to go through first. The super darkness also didn't help as looking at the door was hard, but it did make things really spooky! The demo was really linear and just made the player go in circles as things happened which helped in not confusing anyone. So maybe adding some indicators to go upstairs or to a door in particular would be beneficial and also keep people intrigued so they might not get stuck? (Again, this could just be my thing, so ignore this completely as I can be very confused in games if it is.)
One other suggestion is maybe to add more spooks at the start of the game; there were more of them towards the end and hence I found the end a lot more immersive than the beginning where nothing happens until the player figures out which door to get to.
Other than that, the scares were really great, and you somehow managed to make both the ones at the end super spooky! Loved every minute of playing it and great job with taking a promising demo and making it such a spooky game! (The suggestions above are just my thoughts on the game, I mean no foul with any of it, I really did massively enjoy playing this game!) Good luck on the next one or with any updates you do!