The mix between Slenderman and the Stanley Parable-esque narrator fit really well! I've not seen many combinations of horror and humor so that's a pretty original twist.
The ambience is great, the narration is great and I'm guessing made by a professional. The sound got me a bit confused, specially when the monster is chasing you (the bell sound is bad at determining distance, and the monster steps make no sound).
The biggest bug I found was that the flashlight beam seems to affect the monster arbitrarily. Perhaps the cone/raycast of the beam is tiny or offset, or maybe the monster's hitbox is smaller than it should be.
The disappearance of the path and the sparse use of notes as alternative guidance are cool mechanics and will probably scare more people than the monster itself.
Good job!