It works well by successfully building tension, and using sprites to represent apparitions was a nice touch. It gives them this "unreal" quality.
My only real gripe is that one screamer. The voice saying all that stuff to the player was creepy, but the jumpscare directly after was just funny with how obviously placed it was, and ruined the feeling of dread that had been building, as well as any immersion.
Still, only a single gripe is really good for any game, much more so for a horror game. Looking forward to seeing what else you guys come up with.