I agree with Chereb, this is exactly like an old school Creepypasta you would see on Reddit!
I will admit I was skeptical at first about this title, but overall seriously ended up enjoying it. Despite it being probably one of the most simple games I have seen so far, it uses that simplicity to trick the player into a false sense of security! Not only that, it does this exceptionally well!
My only complaint is indeed how short it is and the fact that it almost borders too simple.
Never the less, you have made an excellent example of how less can be more! Great job!