Not to answer your question but it brings back some nice memories. I was in college when author started this project. He worked a lot on it. After a few years, he stopped and archived the project. Looks like it's back again. Nice!
I used it in all my college demo and small projects and I loved it. The most complex GUI that I made was a oscilloscope frontend for lab-made signal recorder. It is indeed a simplegui library.
This is an awesome library. I've used it for multiple, mostly internal tools. The more complex one were a tool for cardiac action potential analysis and another for the evaluation of multiple choice tests. Complexity exploded over time, but that hinged on my coding skills, or lack thereof... PySimpleGUI did enable me to make GUI tools without getting my hands dirty outside my Python world, so kudos for that.
Protip: the 'Reddit' theme looks way more modern compared to the other ones. Use that to get away from the 90s looks.
I used it in all my college demo and small projects and I loved it. The most complex GUI that I made was a oscilloscope frontend for lab-made signal recorder. It is indeed a simplegui library.