This is a unique entry. It's kinda weird to find that word is descriptive of my thought since it is inspired by the Chthulu Mythos, and although I do love the mythos it usually isn't described as unique in it's modern world incarnation.
What makes this entry unique is its intent. The goal isn't to fight monsters, or really even solve puzzles. It feels like a piece of bigger whole that is made around the idea of embracing one evil over another to prevent and reverse the miseries.
And to embrace this, the players must make sacrafice of themselves and very likely others who will need to be coerced to participate in the rituals alongside the party by their will or against it.
Honestly, when I read this it feels like the plan of a villian in the game that has a kind of noble goal. Otherwise, I'm not really sure how to use this.
Maybe outside of this contest with additional supplementary materials this would be a more compelling dungeon/adventure?