Absolutely amazing in atmosphere! I am playing near a window open to a bright sunny day and I got shivers from walking these claustrophobic corridors.
Incredible touch with the notes, one of the last ones that was unreadable made me very uneasy!
I liked the graphics, its deterioration near the end really added to the feeling.
I'm not sure if it was intentional or if I was imagining it, but there seemed to be moments when something was near, though I turned around and there was nothing there.
Kudos on making such a simple and genuinely creepy experience!