In one dev's log there was information about Developer has made some dudes, so maybe those dudes will be a victims or found bodies in forest. Maybe mc with girls are going to found them and that's why horror tag is needed, it would bring mystery to game who killed those dudes without hurting girls.
I think developer is aware hurting such beauties would bring many broken hearts and they are not going to do it
I have bad feelings about Acting Lessons also and jokes about Yandere are safe for girls cause Yandere are almost always hurting mcs, males in games and girls who are not Love interests.