PAY TO WIN Game itself is challenging and rewarding. But it's ruined by the way the game forces you to buy gems in order to continue. It doesn't matter how skillful and quick you are, you simply don't generate any gems so are forced to buy them or give up when you reach a point where you don't have enough gems to upgrade your facilities, meaning it's genuinely impossible to deliver food to guests in a short enough time. So naturally, I gave up because I'm not falling for the scam. Big shame.