Some notes after reading it closely, trying to setup a play-through for myself:
1. It seems like how you recruit an NP-CM is left up to the solo player for interpretation (whether you role-play out finding one at the spaceport, make a Brains save to find one, or write up your own procedure) - I don't think I missed a rule or procedure around that, other than your Credit Score being a bit of limiter to NP-CM recruitment but let me know if I misunderstood!
2. The Loyalty Stat wording seems at odds with itself:
NP-CM's Loyalty Stat is equal to your current Credit Score, fluctuating as you gain and lose money in your journeys, with a Stat maximum of 5.
Surely the NP-CM's Loyalty Stat can go higher than 5, right? (As evidenced by the Talent Pool table showing possible Credit Scores of 31+) I think the wording is off or I'm misunderstanding Loyalty as a Stat.
3. The Attack Action notes that when an NP-CM attacks, "roll 1d3 and use the result to calculate both the Stat roll and Attack damage". I'm not clear on how a result of 1-3 is going to correlate to a Stat roll. What is the intent here? I wasn't sure NP-CMs had the core Brain/Brawn Stats but rather it seemed like mostly provided Talents that could be used in the game. Do they also have the Core Stats?
4. On a positive note, the Wild Card concept is a good way to reenforce what seems like an implied setting intention that NP-CMs float from ship to ship looking for work and don't typically stick around to form a long-term bond with the crew. Cool sub-system there!
Sorry for all the questions but thanks for making this. Like Perplexing Ruins on the main page comments, I think a game jam for this would produce some really interesting variants and expansions.