Woah! That's really cool to know that it worked with a pen tablet!
I agree with you about the clicking. The idea was that as you played the game, the amount you would have to click would reduce significantly. I wanted a tractor where you could just drive over the plots to plant and harvest. I was going to have a windmill upgrade that would automatically turn the mill. In the end I ran out of implementation time, and I didn't have sufficient time to balance costs, so some of the upgrades I did implement were too expensive.