i think the jumpscares in the game are when you enter the previous room just to find there are stronger and toughter enemies there. It would be fun if there was even a boss waiting for you.
P.S. the gun is already overpowered but it cant block spells. Making enemies that gunfire wont work on them would be great as well as enemies that spells won't work on them. 2 extra types of enemies like spectral ones vs psychic ones would be litteraly amazing.