What a great idea! It neatly solves the problem of tedious backtracking. The cool new mechanics just keep on coming, and then there's the night section! I had a whole lot of fun but my clickin' finger got tired and I had to take a break, would love to come back and finish it. As IronPowerTGA said, might be better for touchscreens, a lot of tapping is easier than a lot of clicking. And like Gearless said, dragging to cover a lot of ground, even if only the basic 1U grow, might really help, maybe only pan if dragging where there's no planting possible.
I noticed I could charge the orange meter just by toggling fans, might not be intended.
Edit: It looks like I was already almost at the end. Great work, thanks!