Nice and chill game but I would go with less bright background color so that moving enemies are easier to see, don't need to be solid black like pacman but orange levels are highly tiring on the eyes which isn't what the game should be, also I would square all of the characters including player and diver guys, think of it like bubble bobble sprites, they clearly fit in a square so there's no guesswork if someone's about to hit you or not. Also slowest speed is bit too slow but it's not that much of an issue, still could add something for it like one time limited boost per level or something.