A good horror game? Or any game?

I need a good horror game for PC… Oh and free, i can't buy stuff on steam._… I'm one of those gamer girls xP…
It doesn't have to be a horror, any good game… What i'm playing now is:
Resident Evil 2/3/4, Don't Starve, The Forest, Minecraft, The Sims 3/4, GTA 5, Avatar,
The Walking Dead (I CAN'T WAIT FOR SEASON 3, oh and i also love the series:3) LoL, N4S, TombRaider, Dead Rising 2/3,
Injustice: Gods Among Us, Payday 2, CoD (Sometimes at friends house) Wolfenstein The New Order and also a lot of PRG Maker games, I LOVE THEM! X3

I just played a really fun game last night called Five Nights at Freddy's. Not sure if you've ever played it. You should be able to get a free demo with Steam.

Slenderman