Alt+F4 might be the only way in full screen. You can also close the window when windowed.
Thanks for the reply! Yeah, playing in full screen. I only thought about it because I was in game and wondered if I could quit back to the main menu to watch the intro! It's not an issue at all.
Anyway, thank you for all your work on this, been playing it all day with moody dungeon synth music playing in the background. It's definitely a vibe :)
(Amazing job on JSW on Vic-20 too BTW)