You can't play for long. You run out of energy and item generators take too long to regenerate when you do have energy. But the main reason at the moment that I'm giving it a one star is because I can't play at all now. When I open the game it says I need to download the game to play. Click the "x" it does nothing, click "download" and it brings me here, where there is no update and I have the game downloaded already. I tried deleting it and redownloading it and it does the same thing.