It's not nearly as good as you think.
The game suffers terribly from insane repetitiveness. You encounter the same, obstacle-blocked, scripted enemy in about 15 encounters in a 4 hour game. Special animations for jump scares and character behavior are limited to a point where you see the exact same animation of a person waving his arms and then crawling under a bed in three different locations.
The AI is broken by a twig.
It has SOME good moments, and a single segment is really well made and memorable, but this should be a 1 hour game, not a 4 hour one. It has unique content for exactly one, and then it repeats everything for three more.
The first two-three chases are great, atmospheric, hbpm increasing. The following 15 are not.
The reactions in the video were all to jump scares, and if jump scares defined horror games, that one flash maze troll animation would be the greatest horror of all time.
I still find it a better horror game than the first Amnesia, but in Dark Descent's defense, it was a pioneer of sorts...
..and no, this is no pointless bickering to make myself sound tough and bash a poor indie developer. I've recorded my entire run of Outlast, and aside from the initial "WOAH" and a surprising "OH MY..!" a few hours in, i could recite Shakespeare's works during those.
To add some plus sides, the music is well made, the game looks gorgeous, and the characters are well made.
The AI and level design branches of Red Barrel have A LOT of work to do, though.
They perhaps should've filled the game with puzzles and / or more lore, instead of yet another dozen chase segments.
Edit : Also, stealth is completely unnecessary. The enemies truly are retarded, and you do not die to a single hit. Furthermore, enemies take A LONG time to swing again.
Chris is the worst of all.. Tic Tac Toe has more interesting and unique moments than the 3,5 hours of Chris on the screen.
I have hopes that Red Barrel will improve upon this game, and make another one. They have potential to make something truly remarkable. Outlast just wasn't it.