It is a very interesting concept for a game. However, I do agree with all the comments. The energy system is ridiculous. Twenty minutes of play time and then 26 hours of waiting to refill. Developers claim ads are available to boost energy but I haven't seen anyway to access those even if I'm in the mood to watch a few. And I'd expect the return on investment to be rather low considering the prices to pay to play. Developers loosen up on the energy requirements or I'll lose interest real fast.