A lot of good feedback in this post. I will admit, when I picked up Omphalos, I found it a little less helpful for my Ryuutama game that I expected because a lot of it was very *specific.* Like Andrea, I was hoping for something a bit more generic and reusable for fantasy OSR. While there is tons of lovely, evocative, very specific stuff here, it means once I've drawn the 10 of Swords for a town... I should probably take it out of the deck. It's too specific to be reused on additional towns.
There's still a lot of great stuff in Omphalos and for His Majesty the Worm I think it will be fantastic. It's still useful for setting generation, but more in the way of PARIAH or A Thousand Thousand Islands--this is very much specific metaplot to help you generate detailed session content, not so much broad idea generation.