Very cool mood! The backgrounds, music, sprites, and UI all blend together well with the story and subject matter.
I really like all the occult and in-game lore there is to digest here. I'm quite interested by the Horse of Satan saga, sounds like it'd have bad sequels. Audio guy (or girl?) was my favorite character. It seemed appropriate that the characters remain nameless, especially audio guy. I hope he or she is still okay.
I don't have many negative criticism. The killer's motivations seemed a little haphazard, which I guess makes sense though, and I felt like a certain expert character should have known better. All in all, this felt like a genuine Friday night 90s horror flick and was well executed all around. Nice work!