you should also change your instructions to match what you say in the game. like Capacity no one knows which button Capacity corresponds to. and Marketing has the same issue. take care to resolve this issue before it becomes an issue. game play is good, but the User Interface needs a lot of focus. if you run out of UI Ideas do research. look at other games, look online at pics, etc.
you should add settings to do diffferent things like change screen size,
you should add buttons to zoom in, zoom out, buy upgrades, and everything else
you should also utilize the whole map platform, and move on to other cities. there is probably more but this should take you a while to program.
 "Factory idle"){kind=icon}
 "Idle Drone Delivery"){kind=icon}