Thanks for your feedback :)
If you're using keyboard-and-mouse I know exactly what you mean by the bugginess and less-than-optimal controls.
I accidentally made this mostly for gamepad (because that's what I was using) so the keyboard-and-mouse controls are kind of annoying.
As for the buggy harvesting, I was running out of time so I just threw together a simple (but not very intuitive) system for harvesting with the mouse. You just have to make sure you move the mouse between the left and right halves of the game screen instead of the left and right of the plant. (I kept doing that and I MADE IT)
If you're experiencing some other harvesting bug, let me know and I'll see what I can do once the jam is over. :)