DigMine QuickFast by aroymart 2014-08-31T08:05:00
Changing background colors and swapping out NPC graphics on each progressive stage is a pretty basic way to execute the theme. (Really, this game is much more "Resource Gathering" than "Connected Worlds")
However, despite the loose connection to the theme, I always have enjoyed these types of games. I played through the whole thing, and had fun doing so. Good job on that end.