[@Xacha] Its really an excellent system for crowdsourcing creativity and pace. It stipulates when supernatural elements can be added in overtly and when they can be alluded too so it builds in the slow burn. It also uses a collective head cannon where everyone has to keep track of what is going on in their own minds and then you pick the best one. You might have to add rules for action though as in Lovecraftesque the protagonist is always kind of passive, just like in the actual stories.