Small update:
Individual edge distribution: the worlds have their own distribution. For example: Vikings have more water tiles than the ice world - which makes the viking world easier to expand. This will influence game play difficulty later, when more worlds are being added.
Bug fix:
Solved an issue where sometimes tiles appeared to accept the wrong neighbor edge. (A big thanks to the person, sending this via bug report! This actually helped me to find the issue that bothered me for a long time now, because it happened so rarely!)
The "Quit button" is functional now. (I should stop quitting with alt+F4 when testing...)