(Your game begins at 12:23)
So - having provided short stories for a horror comic zine myself, while that is not comparable to making a game, one thing I do know about delivering a short experience at limited time is that when you can't get super elaborate for a story, you have to deliver at least one cool and unique visual.
This DEFINITELY delivers that when we get to the spooky highlight!
It's almos ta little unfortunate that the game continues after that and is fairly calm, especially since it's not entirely clear what the context is for it, but the buildup to the main scare and the scare itself works really well and is certainly unique. I enjoyed it greatly.