First time poster, long time player. I'd like to contribute some pixel art units and other stuff.. But I don't know how to make a ruleset (when I tried, the game crashed and wont load

I'm still working on the city/terrain. Here's what it looks like in-game (note this is just an amplio recolor for the most part):
Features:
- Culturally diverse troops (though probably historically inaccurate)
Civilians face right, military units face left/neutral
16 bit color scheme
Modified amplio tileset to match colorscheme
Hopeful Features (not sure if possible to implement) :
- Cities that grow beyond the size of the (apparent) tile
Additional resources
Buildings and wonders (this is going to take forever)
The units at the bottom aren't 100%. Shadows and positions should be fixed.
Anyway, I'm looking for critiques, and help! If you have any recommendations or requests, please let me know!
Credits: Allard Hofelt, Harlan Thompson, Morten Blaabjerg, Captain Nemo, Fairline, and DB