Just doing a run with Nubia. Very well designed civ. Not too weak and not too strong. Thank you for the solid work!
The UA production bonus is solid early and throughout the game. Makes for some interesting decisions early on.
The conquest bonus I did not use yet, but it sounds very juicy for leveling up your units. Like getting another CS conquest quest.
The archer allowed me an early rush to take out Korea and is still contributing to sieges along with cannons.
The UI gives very strong culture and faith. It incentivises you to conquer early and to delay getting to a new era. Having an archer-heavy army works well here. You don't need gunpowder or rifling as much.
The Medjay is a good source of happiness and gold. The AIs bought about 30.
The UB fit the kit well since I had lots of faith at that point and instantly bought it in every city.
All in all, I would not change anything. Feels great to play Nubia.
Just one question: why was the archer renamed? Apedemak archer sounded quite cool IMO.