The way you used the color pallet was very nice. The sprites drawn in your 3 base colors were convincingly map-like, and the accent color was super cleverly used (I also like the full pallet swap for imperial-ness, it made it so I never placed an imperial by mistake)!
I wanted to understand all the mechanics so I had to play through it a few times, but it was fun to learn everything. It would have been a bit more playable if game was a bit easier, but of course that would have detracted from the theme of Roman rule (and I could have ended up spending far too long playing). At least once they gave me directly contradictory decrees, I would have been made, but it just made me laugh.