published a new version of it - no errors appeared on the previous version here (Ubuntu 20.04 amd64 (GNU/Linux), Python 2.7.18rc1, Pygame 1.9.6 ) - perhaps the error appeared there because you're using Python 3.x, or other operating system?
Maybe, I think I have the same pygame version but I have Python 3.7 on Windows 10. I just commented because someone could be curious to play and not understand python enough to even know what the error was, and this error also happens on the "Plumas e Sardinhas" game. Thanks anyway.