I really liked the game; it’s well set up and succeeds in keeping you alert.
What I’ll share is my own opinion that you could consider to improve the game, for example:
- Add a key that lets you look behind you, so players stay on edge.
- Include more “strange” sounds as the game progresses, or something that alerts the player.
- Deepen the story, or add different notes written by someone else to give a different point of view.
As I said, these are things you could take into account to improve the game, but the game is already good as it is.