Teaching a Spaceman to Spacefish

I've got maybe a year or so of my Insomniacs playtest campaign under my belt, but I'm struggling with how to put that into actionable content in the book. I don't think I've ever used a setting or module verbatim, and I don't know how other GMs adapt canned material for their own campaigns. I have a couple paths forward I can take, however, trails blazed by other designers that have inspired me.

Where is Insomniacs?

When I was working on my last game, Glow in the Dark, I ran into this late-game slump where I'd foolishly formatted the text in my draft and now had to redo all the graphic design work. I'm proud to say that apparently that was a learning experience, because I've moved the Insomniacs text over from my google doc into Affinity Publisher way earlier than I did for Glow.

The Fear of Geometry

A phenomenon that I've seen crop up in different media is the use of geometric shapes as otherworldly counterpoint to the "normal" world. It's eerie without being traditionally creepy, but I wonder if there is some base fear these portrayals are delving into or if it's just become shorthand for unknowably alien.