Really good game, I got some pointers if you're interested :D
1. Opening doors is a little wonky, sometimes they open after 1 click, sometimes after 2-3, so I would change that to either using E or just 1 mouse click.
2. It's never explained that the guy in our apartment is our brother, so you should mention that before the ending.
3. Spaces are weirdly big, so you're not very scared because you have a lot of room to maneuver if something scary happens. I'd make them smaller.
Overall, it's a nice game! Keep it up!!