First of all lemme thank you for this masterpiece, it's so helpful!

So, I guess you use random seeds to generate the map, if you you make it as a user input it would be very cool for re-editing the map style after you change your mind later or something.

Cheers!

You can specify the seed in the standalone version (http://fantasycities.watabou.ru/) in the url (seed parameter). Or you can just copy the whole url and paste it later. On itch.io I can't access the url, so it doesn't work here, but I will probably implement an input field later.