Interesting mechanics and gameplay loop. I felt as though the duration was perfect as well, giving the player enough time to learn and set up their village/resource gain without becoming tedious. This was a great concept and was well worth the time spent.
My only complaint is that the text at the bottom of the screen is difficult to discern. I also encountered a bug in which I could not destroy one of my lightning rods, but if I tried to it would instead dismantle a different structure on the map in order from most recently purchased to least.