So I downloaded the game manually on Linux, but it crashes on start. Console shows “OSError: Couldn’t find file ‘gui/window_icon.png’.”
Checking the game files, there is no gui folder. I copied gui from another Renpy game, and I could start the game (of course it completely changes the mood). But then BG and character sprites are still missing, so I only see the text.
In other words, all the assets are missing!
Did you exclude them from the build?