Thank you, glad you like it! And thanks for letting me know about the NaN, that gives me an idea for how to fix it.
- The city titles are just a bit of historical flavour. For example, Uruk is "City of Heroes" because the hero Gilgamesh was from there. It doesn't do anything else.
- The enemy king's personality determines the battle tactics he's likely to pick. For example, a "cowardly" king is much more likely to pick a defensive tactic, so an indirect tactic would work best against him.
- You can get a "Crushing Victory" that gives 9 VP. You'll probably need to outnumber the enemy, pick the right tactic, and be pretty lucky as well.
- As for whether the gods exist, or sacrifices do anything – I'm afraid that's not for mortal humans to know. All I can say is that the Mesopotamians certainly believed they did. Have you tried sacrificing to a star yet?
I'll think about the population growth and the soldiers. That would add a lot of additional complexity to the system, though.