I agree that only one key slot would have been even more fitting to the theme, but I found that too limiting (to be honest: I also found 4 keyslots to be quite limiting still :D). However, this game shows that it's by no means impossible - give it a go as well, if you find time!
Yeah, never even bothered exporting my games with Godot before this jam. So all I did was hitting the export button on the presets, hoping that it would work. Turns out: it didn't. :( At least not for anyone. May I ask what resolution you used on your windows machine? The game's resolution is 1920x1200 and not setup to strecht (or shrink) in order to fit the full screen. I would guess, the problem you described might be caused by this. I'll try to fix that issue and take a closer look at Godots export capabilities once the jam is over.
Thank your for pointing out that issue! And of course: Thank you for playing! :)