How to quit out and close a game?

If you compile a game for Linux (which produces an appimage) there seems to be no way to quit out of the game. I tried an example game and the app goes full screen so it's not easy to get out of the running app. I think something like system.exit() is needed.

I like this idea, having something like this would be very useful.

Yes, and for Android too

maybe this is already solved but if you javascript window.open('', '_self', ''); window.close(); works on the windows and linux exports.

Well now we have system.quit()