I had to use the unlimited money cheat to figure out what to do, and buy the seeds then put them in the ground. It definitely needs a tutorial because it does work, but the players don't know what to do. The seeds are hidden on the right side of the screen so well you don't even know they are there.
A lot of the mechanics are there the player just needs some hand holding. Maybe have the farmer use speech bubbles and explain what he needs to do and what the goal is. I hope you do go back and finish it and update your game even though the jam has ended!