Co-op horror

[Ghieri]

If the players are mature,

Relying on the players to properly interpret the gameplay the same way you do is leaving yourself to a very small fringe of demographic that may or may not exist. Therefor really not worth the time, effort, or money of full scale production. Co-op is a mechanic fundamentally designed for "fun" gameplay, which is why it is fundamentally incompatible with horror.

EDIT: I made puns and instantly regretted it.