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Right, that’s what I thought and why I asked. It seemed to contradict the rules. 

The step below Mature17+ though is Teen, which allows for some ”crude humor, suggestive themes” but it also states ”minimal blood”. I’ve never seen anyone on rmw have any problem with bloody/gory horror games so I can only assume that part is okay.
Usually when people get offended by a gme, it’s because of sexual content, extreme language or a sensitive theme (religion, abuse, etc). So maybe safer to stick to the Teen rating im regards to those elements.

Calunio's games rule BTW. Kind of off-topic but it's a great example of creatively justified high ratings! Beautiful Escape: Dungeoneer is probably 17+. Polymorphous Perversity on the other hand