Very peaceful entry, that was nice to discover ! I really liked the clean art style and pace of the game. My only complain would be the size of the collider box for the ship, which is bigger than the sprite and feels a bit unfair when you crash, but that's a small issue. An interesting addition imo would be something that hints the direction of the fishes, so you always know more or less where to head :)
(And plz a gun to shut these damn gulls up)
So overall, congratulations !