This isn't a game, it's a production line simulation. Or perhaps, considering the numerous "opportunities" you have to watch an ad for a reward, it's just an ad revenue generator. Eventually you discover that practically none of your hard work in managing the line carries over when you advance to the next higher factory. It's not a bad time waster if you can cope with all the ads as there's no reason to spend real money yourself to keep "playing". Uninstalled.