FOSS gamedev and creative worlds

You live in a nice little town. You are the mayor/builder/fixer of the town. You are very happy in your town, but the evil HEROBRIAN has been trooling you, magorly. After you fix up your town, go to your naboring town and confront the evil HEROBRIAN'S town and burn the statue, but dont forget to look in-side first. >)


See a video on this (spoiler) https://www.youtube.com/watch?v=FDy4NU5VA88&feature=youtu.be

It looks nice but what are the mods of the map?