It's actually not that easy to just save the AI state. If you restart from scratch, it's going to make terrible decisions... You need to save what it wanted to do with its villagers, things like that. Sure you could try to guess it backwards on loading, but some stuffs won't work (defense, attackā¦), and the way the AI is coded currently makes this extremely unpractical too (sadly). Fixing the Ai for saving games is actually not extremely hard, but doing it right is hard. And tied with how javascript fundamentally works, which might change as we are considering upgrading.