Aaaah I see. Now i get it lol.
Played it again and gotta say it's a solid minigame! But i wasn't quite sure why i was catching fish and what purpose it has selling them (except making money) but maybe you're still working/figuring that out :)
Would still recommend to show of the controls a bit more clearly... Maybe right on the main menu, a quick screen before the game starts or an in game tutorial...
Nonetheless had fun while playing it.