Looks like dev has both a "Game" folder and a "game" folder in at least the win/linux download. I'm not sure if this was intentional because the Game folder has fonts and a cache subfolder while game has the usual annoying rpa archive(s).
I don't remember if NTFS on winders will create both folders when extracting and then do its usual thing of ignoring case when looking for files. I haven't finished looking for the usual bullshit tactics devs use to crapify the user experience so don't know what this sort of thing does on Linux and other case sensitive platforms. I'm guessing Renpy will look for stuff in both.
Looks like I just answered my own question since this sucker barfs looking for its fonts.
Code:
raise Exception("Could not find font {0!r}.".format(orig_fn))
Exception: Could not find font u'NanumGothic.ttf'.
While running game code:
Exception: Could not find font u'NanumGothic.ttf'.
I shoved everything in Game under game to get things working.