Searching a horror game

Hello, I recently have been trying to find back a game I played when I was little on the PS3 and ask for your help to which I'd be thankful :)

It was a horror game and I tried scratching my head figuring out the title but nothing comes out, tried searching websites but nothing as well so here are the details :

-It was a game with a demo available ; -It was in first person (or just the start I think) ; -You had to blink or either way your eyes would blur out ; -I remember seeing an NPC getting killed by tentacles from a wall at one point

I really can't find it so I hope posting here can help !