Neko G Man

I wonder may I create some mods for game, but it's on unity 3d and it's hard to understand how to do that, so I have idea, on main map of adventure it's abounded island (tornado ot something like that) citizens disappear, you travel all bioms find them, rebuild city, and after all got nice city where can be market and you can buy any resources. There can be some quests to upgrade city, market to shops, guild of adventures build or something like that