It might be possible to find the “grimdark” fan base of games like undertake which grow suitably large, and the fans of deadly horrors like danganronpa and Doki Doki Lit Club. As well as fans of slasher movies and dark stories.

Mix those all up and see how far into guro you can push without breaking the core tenants of any of those groups and you’ve got something that might please a very small segment of the very smal guro crowd while also enticing the rest.

Hmm... I might play all those games watch all those movies and read all those books I just mentioned and see what ideas I get.