Ah, good question! Right now this only works via the itch app - basically you need to run java.exe with the correct parameters. I'll create an bat file ASAP. If you're feeling adventurous in the meantime you can try running it though using the arguments in .itch.toml... although I'm not sure if you get that file with the zip.
I added an executable called run.bat in the latest -experimental build - if you double click on that pyxyzygy will start. Please let me know if it works for you!
