Thanks for the feedback! Indeed, some of the objects could have been represented clearer.
As for the close button problem, we have not encountered it on our test platforms (Windows 10 and Fedora). We will keep an eye out for it though. :-)
The close problem happend, when I started the game source from the Python GUI (IDLE) on a Windows 10 system. Perhaps this is an odd way to start the game. Regarding the objects, I'm curious: What does this big T with the 2 gray colors stand for?
It is a hammer (it stands for tools). We rushed development of the renaissance and future eras, so they are not as clear as we would have liked.
