Looks good, but I have a few suggestions for this mod:
1) There is no building or wonder that has any effect on food / population. Adding a whole extra age, and another happiness building, you'd think there could be a simple +5 food building, such as a Restaurant.
2) Versailles: increasing the length of the "We love the king" day is very lackluster, and utterly useless when you have all luxuries anyway, which in most games you will eventually have through cities and trades. It doesn't even have any decent passive values. It sucks, plain and simple.
3) Change to Hospital: +2 food. If a city is captured the population will be reduced by 25% instead of half. Grants immunity to sickness caused by Saboteurs.
4) new unit: Saboteur: 4 movement Civilian unit enters lands freely. Poisons water wells and spreads sickness in target city, reducing the population by 1. Expended if caught. 50% chance to get caught. Causes war if caught. Steals a bit of gold and puts the city into resistance for 1 turn.
5) new unit: War Baloon: Enlightenment Era flying unit. Drops explosives on cities and units. It should probably be free range like the helicopter gunship, withdraw on melee, 3 movement, floats over mountains. Would be nice if it floats over water instead of embarking. Ranged unit. Range: 1
6) Barrage Baloon: Upgrade for War Baloon. Better combat and ranged strength. Defends against enemy aircraft when stationed in cities. Helps defend units like an early anti aircraft gun. 4 Movement.
7) New Religious Unit: Athiest. Similar to Archaeologist. Can only be built, city must have a Public School. Reduces religious followers in target city by same amount a missionary would add them. 4 movement. 2 Uses. It's basically a non religion missionary unit. Doesn't work on Holy Cities or cities with inquisitors.
8) Plague Missile: damages city and reduces population by 1. A city with a hospital is immune to the population reduction.
9) UFO: Information era upgrade for Helicopter Gunship. 12 Range. 90 Strength. Fly over mountains, cannot capture cities. Move after attacking. Withdraw on Melee. Good at fighting giant death robots, which are the final upgrade for tanks.
UFO cannot plunder. Instead it makes special improvement: Crop Circle. +1 Culture and +1 faith. May only be built on flat terrain. It can capture (Abduct) civilians.
Another issue is that you have to wait until the industrial age to buy great people with Faith. I fear that adding this age would set that feature too late in the game to be useful. As such, it would be better if the game stopped forcing you to buy prophets during the enlightenment era.
Ideologies also get pushed back farther into the game. I never get resettlement as it is, seeing as all my cities are already built by then. To fix this, just get rid of the 3 factory requirement so that everyone gets ideologies upon entering the industrial age, or require 3 of Enlightenment Era building.
I feel like this was only really done because Factories aren't all that great. At least not when they first become available.
Coal is usually somewhat rare, and their maintenance cost is high. This and getting you to burn a lot of gold.
Is there attribution inside your mod's metadata?
