Thanks for your reply and yes, I would like to test the full version of the game.
I just came around some issues:
1. Tactical map: When you kill an enemy next to a car, the death-animation goes through the car. It is really a minor issue, because at the end of the animation everything is fine again.
2. Strategy map: When you move to the last available village in the demo version and don't do anything for a long while, your allies will conquer almost the whole map. After that, nothing occurs for a long time. But at about day 200 the paths on the map start to flicker at random. The flickering increases and finally the whole screen flickers and leads to a total system crash, forcing you to perform a hard reboot (tested on Ubuntu 20.04).