A few things caught my attention.
Horseback Riding and Chariots should probably switch places, as they might have been historically.
Currency and Trading should swap places as well, as trading have existed in some form long before any currencies were made.
These are just suggestions though.
This needs more things to do with gold.
I have bought everything that required it and now I'm just getting more and more.
What's the point of not having anything to spend it on?
You know what would be a nice idea?
A button to switch on and off the golden suit once it's bought.
Maybe have it look like a dresser or some sort.
An even nicer idea: New fancy-looking suits unlocked by completing certain milestones.
Some could even be bought, such as diamond and platinum suits.
It would be a good idea to split the upgrades section in two. So that angel investors and regular cash is separated from each other.
As things are now, I tend to accidentally spend angel investors too early.
This game could need some kind of tracklist manager, so you can choose what tunes you would likt to listen to or which one you would like to disable.
Because there are those I prefer over others, but this is just a suggestion.
I made some changes with the update today, maybe they improve it for your city! (Maybe not, but I hope they do!)