Making good progress, but still much to do
I finally found out, what was causing pygame to segfault. I was drawing aalines outside of the screen (I admit, way outside the screen). This apparently caused a segfault. I'm glad I found out, although it cost me much time. The bug had his origin in my movement logic. A direction vector got really long, still not sure what it caused it (maybe a calculation error or something). Today I will start making the map and art. And then I have to combine all things to sort of a story line.