At first, the game felt too slow and not really up my alley. After a while, however, it clicked, and by the end it felt worth the time spent.
Gameplay, though slow and simple, started to feel methodical and carried a purpose.
As soon as I understood what's going on, the game became unnerving (in a good sense), invoking uneasiness and tension—the kind of horror I find really good. I think it worked so well, because at first you can't really tell if it will actually go that route.
Music also worked well to enhance the feeling.
I think you've done a great job with this one! Thank you for your game!