I'm surprised to see that this whole thing seems to be implemented in typescript and css, even though it lists a bunch of specific platforms/desktop environments like Windows 11, KDE, etc. I guess it's for use in Electron or something?

Grepping through the code I found no references to aria or roles or title, which makes me assume it's completely inaccessible to screen readers or other assistive tools. It would be cool if the README called that out at least a little bit. It also makes me wonder whether it can be used via keyboard or gamepad instead of just mouse, since pie menus are pretty analog-stick friendly and fairly keyboard-unfriendly. (Incidentally, Windows 11 has pretty comprehensive gamepad support, at least for apps using the UWP/WinUI stack. If you're on Win11 and have an xbox controller, try it sometime - the settings window is a good spot to mess with it.)