Very interested in how you go with ASE (something I've always wanted to run). Would you consider blogging your experiences as you go?
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We explored the gatehouse level and the majority of the first level. Unfortunately, my players didn't like ASE - I think it was boring comparing to other modules we played. Instead, we ventured into The Red Prophet Rises (many casualties, they retreated), then Many Gates of the Gann (exploring more than a half of it) and now we are finishing the campaign by trying to get out of the underworld of Operation Unfathomable. Overall, I think ASE is too sparse (too many empty rooms or rooms that pretend have content, but are really empty - like having broom and a bucket), doesn't have exciting NPCs to interact with, monsters are just bags of HPs. I can't recommend.
In March we are starting Night's Dark Terrors, but this time on OSE. I will see how it works out.
I really like the orbital gods too! Sadly, the concept alone was not sufficient to carry the megadungeon. Gus L. has a cool module about orbital gods infighting https://archive.org/details/obelisk_final , but we didn't get to it.