This is some supremely evocative writing! And my god, the visuals are just so damn good. I love basically every bit of this. Half the game in TTRPGs is posing interesting questions to your players, and this module has a great series of questions. Especially for lethal games like Mothership, a villain who can be reasoned with and "beaten" without direct combat is incredibly welcome. I love a "8d10 instant death parasite" horror as much as the next guy, but they can typically only be run one or two ways. Kier by comparison is a really open-ended and compelling figure and pairing him up with a combat android means you can spin the conflict in a variety of ways!
Only things holding it back for me are some minor typos throughout the text, and I think maybe adding more content to the inside (or shifting existing content to the inside) to balance out the composition since the map leaves a lot of empty space around it. I also think the numbers keying each room on the map could be enlarged/given a white-on-black treatment to make them pop a bit more as they sort of disappear into the linework of the illustrations currently.
Phenomenal work overall! Another of my frontrunners!