This booklet contains many good ideas, but also lots of bad ones, at least in my view.
A few shining points:
- The Owl's Service - it's an ingenious portable and rather horroristic episode. "Certain Doom" included, but one is free to add a sliver of hope.
- The maze inside the Monolith - Some great ideas here. Also some meh ones (the mechanics of brains and guardians feels extremely overcomplicated), but I generally like it.
- Carter's head - Less hilarious than Vecna's head, but pretty cool still.
However, in its entirety, it's not a very good adventure, and also I think it fell short of its goal as an homage to Lovecraft. While the "being doomed from the get-go" part is definitely there, the way in which the doom is happening is rather blunt, and to be honest, quite silly. The sideshow owls are so much better in concept than anything about the monolith per se. :)
I also have serious problems with most random effects being purely detrimental.
Lovecraft's cosmic horror was rarely about "everything is out to get you". Yes, it did happen, but those were his more inferior writings. Generally, what I see as the staple of Lovecraft is the duality of having the temptation of power, and revulsion at the cost of that power - one's humanity - at the same time. Nota bene, becoming an immortal fish person is not immediately deleterious, except for the knowledge that one is becoming a fish person.
That is mainly what I feel is lacking here.