Disclaimer: I built this project as a sample solution for a lecture I am supporting at my university. This lecture is audited by programming beginners and therefore the sample solutions should be rather easy to understand.
Hence, I did not use many libraries besides pygame itself
and did not use advanced concepts like inheritance or polymorphism.
Since the study program, I built this example for has been discontinued, I will not continue to work on it and v7 can be ignored.