I'm by no means the best KF player but even I look on KF from a technical perspective when playing, although it's really hard not to deny the very very detailed maps which set the atmosphere very well. (Shameless plug, I made the Higurashi sound pack to give it more of a desperate and horror-esque feel)
At points when a door has broken while being un-welded to clear the othe rside and there are 2 flesh pounds on the other side, it's more of a 'shock' and 'panic' then I would really classify as true 'horror', opposed to playing games like Amnesia and what not. It gets promptly broken down to: What should I do to kill this giant cluster of enemies with least damage to the team, instead of being "OH MY GOD WHAT CREATURE IS THAT, HE LOOKS SO SCARY
I may be a bit desensatized ever since playing Poundamonium. I almost had an anxiety attack playing that for the first time. My hand woulsn't stop shaking and my heart was pounding. I was out of breath after like, the first few. Then it became "Oh, I can just use the fire axe and do this to them, hmmmm". "Oh, there's a flesh pound guys, i hope you guys can kill him."
I'de say it's alot like when people play Ghouls Forest 3. initially the game is scary as ****, and it's difficult, but after dieing so many times to the ghoulds it's just "SWEET BACK PEDDLE AND HELLA LUCK"
What really makes KF feel horroresque though are those there Mission maps. My god, those actually feel really intense and creepy at times with some of the **** they throw at you unexpectedly.