Hi, great prototype, here some recomendations:
- Disiricts would be great. if its a city, there should be like resedential and commercial districts, they can have like a boost if build next to each other.
maybe military, for expansion.
- there should be the feature to select multiple vassals, maybe like in an rts game. with this drag-box selector, and double click for selecting vassals the same level.
- also it would be nice to open and close the menue.