Art: Love it. I often tut at people relying on found public domain art but this is an example of doing it right, and of course combined with your own original work.
Writing: Great. It does a lot with a little. The visuals and words work together to tell a clear story.
Game Design: The concept is fantastic. Really original and could be slotted into many campaigns. I think the only omission is an indication of their speed or what a typical towing time would be like. Presumably it must be survivable, as long as the Warden rules that the ship can somehow produce food. It's less interesting if the players have no choice but to attack. I think some guidance there would be good... are we talking about trading 1D5 years of lifespan for a tow, 2D10?
Theme: Does Coleridge count as "ancient"? Well, the mariner is ancient and the poem will be ancient by the time we're doing Mothership things in this Universe, so I'll allow it.
Layout: Looks great and is easy to read. If you wanted to fit more material in, there's room for it, but it's hard to criticize anything here.
Utility: Only complaint is the same as for Game Design, leaving the Warden entirely on their own to figure out what the travel time would be and whether that's survivable without cryo.
Favorability: I'll be surprised if this isn't in the Top 10, although I've been surprised before.