Also I think the game doesn't save the settings if you quit by leaving the game by pressin 'escape' while you're playing and then selecting escape to desktop, it only saved it for me when i quit in the 'pre-game' part.
This fixed it for me, thanks!! But how do I specify launch options so it runs it with '-screen-fullscreen 0' all the time? I ran it in the terminal using `./Lumiette\ for\ Linux.x86_64 -screen-fullscreen 0`.