I can't start the game on the Windows build, I'm getting a Godot error about failing to load a bunch of resources and scripts (main_theme.tres, globals/tasks.gd, globals.gd).
I am sorry to hear that. Did you make sure all the contents of the zip file were put in the same folder when you ran it? Seems basic but that's the only thing I can think of that would cause that.
It seems I screwed my final build and somehow didn't test it. Quite embarrassing. I wrote a notice on the game's main page. Please read that for more details. Apologies.