I really like this idea, it reminded me a bit of playing Sea of Thieves. The gameplay itself was pretty good, although I would have liked to zoom out a bit more. The sea monsters are really fast!
I think a bit more polish would make this game a lot better. The UI could use a bit of work, a lot of the elements or text are different sizes or misaligned. I did also miss having audio feedback for things, adding simple sound effects can have a huge impact on the overall presentation and feel of a game.
Overall, not a bad little game. Well done on your game jam entry :)