Best Horror Game IYO??

Have you heard of this hit game called Five Nights at Freddy's?

DEPENDSSSS

if you want something like BIG you can try out "Pocket Mirror" it's a Psychological horror RPG

Also a more recent and better known one would be "Mouthwash" short but amazing! 

And a classic among classics, "OFF", Weird funny horror rpg made in rpg maker

Not the best game, not even really a proper horror game, but I have a soft spot for Fran Bow. That game was my introduction to horror and majorly shaped my aesthetic tastes and art style.

The gameplay is nothing special, just a point-and-click with a kind of environment change mechanic. What really gets me is the incredibly weird (almost Alice In Wonderland adjacent) storyline, and the atmosphere.