Thank you for playing! You are correct that this needs some heavy polish and actual game instructions on each page on how to play. That is a definitive thing to add in the polish phase.
In the fishing minigame you press space to cast down the hook and try and catch pearls/sea shells. Note that you can only capture them while you're casting down, while it returns up it cannot catch anything. I think at the moment it takes a few spacebar presses to actually send it down though.
The cow catching, jump rope and fishing minigames do have a goal to win! If you get to 21 points you are transported back to the main menu having "won". I had thought to add a little star icon next to the minigame to indicate you had "beaten" it but ran out of time (and couldn't figure out how to "win" the dress up minigame.
Thank you so much for the feedback! I will definitively add instructions to each game when it comes time to update it!