It would be another horror game. (Not saying in a bad way, it doesn't has to be original to be good) It could be interesting. It will be something like 'Blair Witch', It will have combat system or it would be a run and hide like Outlast ?
I personally like horror games that rely in ambientation and story to produce fear. Like 'Silent Hill' where you can have lots of guns and ammo and still be afraid of going on. I dislike games that use (and abuse) Jumpscares. Jumspcares scares, yeah, but that is not fear. :-/
It could be an interesting idea. There is anything specific you wanna know? :-)