Just so you know, the game is unable to launch on Linux under X11 (at least in my case, and other documented cases with Ren'Py) due to the "gui/window_icon.png" file being too big. Resizing it to 1000x1000 allows it to launch.
If anyone else has the issue and wants to fix it, go into "game/gui", and run "mv window_icon.png window_icon_original.png && convert -resize 1000x1000 window_icon_original.png window_icon.png".
This will rename the file to window_icon_original and then make a 1000x1000 copy of it named window_icon to replace the original. You can delete window_icon_original if you want to save an extra 2 Mb.