Wow that's an awesome score you got !
There is definitely something wrong with the score, I think the vegetables harvested during the very last turn are not taken into account in the score sent to the leaderboard, I'll try to fix that in the post jam patch. And also yeah, the indications are kind of wrong for the harvest ability (technically it's true that you harvest at the locations shown, except you stomp them first, so you can't harvest anything. we did not found time to solve that unfortunately.
thank you for your feedback !