This is a really interesting little system you’ve created! I’d love to try it out and see how it plays some time when I get the chance. I think you’ve also got the flavour perfect- it gets me fired up to play as a bumbling shiphand! I also like that you’ve kept the premise very specific.
One thing that you could perhaps add in an ‘expanded edition’ further down the line is a GM section. Perhaps you could have random prompt tables for the complications/endings/goals/etc? Overall, great work! I’m looking forward to more haha