Having played the developers' previous game, "Black Market" (not to be confused with "Monster Black Market" inspired by it), I think that even if there are borrowings from "The Forest", it's because the developers liked that.- Maybe 'The Forest' is the best candidate here, since you have 'mostly' the same mechanics and 'in a way' the same plot (cannibals/tribes/cannibalism etc), however in The Forest you're pretty much alone.
- Please check the previously mentioned game, you can actually decorate your house with any limb/head and whatever, you can cook humans, eat humans and you actually get an achievement for that.
So nah, isn't a problem with the mental health, this concept may too be burrowed from the forest.