i want ideas for 3d horror game

for Mobile or PC

A game where enemies are ONLY activated when light touches them or you get too close. Its possible to get through a level without ever encountering a ghost or entity... The fear is put into the players hands so THEY are solely  responsible for how scary it is. 

Perhaps could add sound cues to indicate the proximity of a ghost,  and add in things that could lead them astray, maybe a section could have the batteries die in the flashlight requiring the player to intensely listen for the sound cues. The ghosts could be smart, and lure the player by making different noises, or open & close certain doors. 

its a loose idea, but I think some potential is there :)

You are the ghost

Goal: Scare everyone in the town away.

Feel free to interpret it any way you like.

Let's see:

A platformer with coins to collect and health items and powerups. Player must collect all coins before exit door is opened and must go to that exit.

However, there's a twist: after collecting certain number of coins, level will be darker and enemies will appear. Some only deal 1 or 2 hit points damage while some could one shot player. The less coins to be collected, the more enemies will appear and the darker level will be.