Performing psychological experiments on your customers without their informed consent is highly unethical.
Regarding the unlimited energy, mine didn't start properly, and initially it was using up my banked energy. I had to force close and reopen to get the timer to start properly. There was 1.5 minutes wasted while waiting to reopen. Then the game was lagging and slow. But I did get three of the big trees chopped along with several rock outcroppings. Once the timer ran out, another game restart brought back my banked energy.