Though not specific to the Cthulhu Mythos, The Lovecraft Investigations is highly recommended to any lovers of Lovecraft. It's a spoof true crime podcast set in the present day and the plots are based on classic Lovecraft stories.
As it's BBC, I'm guessing it may be geolocked, but for anyone who can access BBC Sounds the previous three seasons are available and a new one is about to start soon.
As long as is " based on works" is fine š. The rules are more of a guideline to avoid too many different contents. BTW for more "cosmic horror" contents i suggest you all this great community as well >> Lovecraftian cosmic horror !CosmicHorror@kbin.social