Been distracted by messing around with the game too much to remember to post a progress report 😛 It is now sort of playable; the game lasts 500 turns and when it finishes you get rated on how many people are alive. Things don’t always go that well, especially if the climate gets rough:

The world of Omuk did not fare well when an ice age occurred. In some ways it is better to settle in the desert rather than the poles, nothing grows under snow.

I’ve improved the colour palette and added little icons for hills and mountains. Took far too long to work out how to load images in Java, glad I got it sorted. Now I can make the settlements and tribes have icons too!