Murder, Claustrophobia (cause your in like that small office.), It's sort of eerie, you have that feeling of tension, The Jumpscares.
I dont really think fnaf is meant to shock, disgust, people. Its mainly meant for frighten. (also the gore part kinda does but doesnt make sense, you dont really need gore to make it scary.)
Fnaf, tends to be psychological.
Horror movies tend to shock and disgust people, and frighten. (well besides frighten, Fnaf isnt made to shock (shock might just be the whole 'oh kids murdered.") and disgust people.)
I am sorry if you do not agree with my opinion. i dont really think theres a ton of "horror" elements to disgust people. (also yes uh i spaced this out so it wasnt just one giant big mess.)