Thanks for trying the game out!
There are actually two other ways to scare the person: by turning invisible and then appearing in front of them, and by turning lights on and off (I wanted to make an in-game tutorial of this but in the end I was only able to put it in the description).
If you liked the game, I'm considering adding other ways to scare people like moving objects and possessing people. If more people think the concept has potential I'll update it for sure.
Cheers!