Presentation wise, this is one of the best entries I played so far! You totalled nailed the underwater ambience and movement.
I liked the gameplay, but I felt it was too unbalanced, at least for my tastes.
I felt like the hull breaks too often and the fact that you can only carry one scrap or kelp at a time, coupled with that whilst carrying them, I d be unable to interact with anything else, such as the hacking minigame, made the back and forth to the ship a bit too tedious with not a lot of progress being done.
All in all however, this is a solid entry and look forward to more from you ^^