Just like your previous game "Lemonade Stand," the game's concept is very creative, however, this time I don't think the game could become a mobile game, as it seems better suited as a web-based game.
The game presents a rather interesting concept for a web-based game that manages to entertain and relax the player. Despite its somewhat repetitive nature, the fact that you encounter different aquatic animals each time keeps you engaged, mitigating the sense of repetition.
However, I did identify a drawback concerning the implementation of the fishing net upgrade. It appears counterproductive to increase its efficiency since a higher capture rate of lower-value surface fish occurs as a result. Hence, it seems more advantageous to maintain the net upgrade at level 3 and focus on capturing the deeper-water fish. From my perspective, a more appropriate way to implement the net upgrade would be to limit the number of times you can cast the fishing hook into the water, which would provide a more meaningful incentive to upgrade the net.
Another observation I made pertains to the user interface. When opening the inventory and then accessing the collection, the inventory remains open behind the collection screen.
Despite these minor issues, the game is quite enjoyable. It manages to hold the player's interest, and the music selection complements the gameplay effectively, so, overall, good job!.