Sorry for the late reply, I already had that font in my fc-list (I tried to put it in .fonts and update the cache like you're saying too for good measure).
Honestly, can't even guess what went wrong. As I said, there is a check that shows a message and quits the game if the font is not installed, so the font is either not loading properly or there is something else wrong. As I said, I have very little experience with linux.
