I got surprised that players could only use BPs to get slots and build more cities. It is a burden that managing dozens of cities and there's no more fun. And those premium features could not help too much managing so many cities. I think Grepo should have the city's cap say 20 or 30. and getting more slots should be more difficult. And Grepo could add more levels for city's builidings. and people gotta pay BPs to upgrade. For example, people get Farm 46 but they need 1k BPs, Farm 47, 2k BPs.