Great job on finishing your first game! I am in the same boat with you there. I think the game would feel a bit better if the fish could move around a bit more rather than stuck on a line. Even if it was limited to the left half of the screen, being able to move a bit more would help with being trapped by some fish. I did have fun with it and it was successful on giving me anxiety as I wondered if I was large enough to eat a fish or not.
Be proud you finished a game, not everyone can do that!