I shoulve put this in the game, but you need to click the red door wit's the save icon to save. If it still isn/'t full screen, please let me know.
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Sorry for the late reply. I did that and it did save the game's window state.
If you are open to suggestions, i would save the settings when you press the quit button on the settings screen, instead of when the game is closed. You are welcome to ignore this recommendation if you want, i will not hold anything against you