First, congrats you made something hella cool! love the vibes, and the overall polish is on point!
I think others have hit on a lot of good points as to where this modules shines and where it could use some work, but my one bit of added advice is to look at things in terms of what Justin Alexander calls “the vectors of play” what ways are you helping the PCs engage with the world/adventure, what obstacles can you put in their path to keep them from just hopping back on their ship and GTFO… I think you have a grade A setting guide, with some interesting adventure ideas. This keeps things from being easily usable but it is GREAT when it comes to giving ideas for things to do with the world.
All that said, you made something cool, be proud! hope ya do well in the comp!