I liked the environment. The sound and the art style came together nicely to give it a nice ethereal feel. I think it could have done with a bit of an explanation on how the fishing works because I still don't quite get it. When I did manage to reel in a fish I liked how you had to determine the details of the fish. I think that gave a nice twist to the game.
Also, this is something small but I also really like the menu buttons. I can never seem to get mine right and yours looked really good. Is that a plugin or did you use Godots built in tools to make them?
Overall I enjoyed this experience. Nice work!