Very clean style with the soft greys and crisp illustrations. I found the map and location rendering very helpful. I would probably sacrifice the read-aloud text for bolding and additional treasure, but there's clearly thought put into the dungeon location and the unique sea hazards, which is great.
I really liked the seaweed-and-soot disguise detail of the bandits, and it made me want a bit more on them: a leader or gang name, what they plan to do with the missing crew, etc.
I think adding some additional options for learning about (perhaps within the shipwreck?) or interacting with the Ancient Hero would help to make his presence less random and punishing. Him not speaking the language of the characters also complicates both his offer of help against the bandits and ability to explain his cosmic purpose before disappearing with the time stone (seemingly for no reason from the players' perspective). But I certainly understand that both page count and deadline get in the way of the ideal! Nice one, Jacob!