I'm on Linux, and I noticed that the accessibility settings includes an option to change the font to DejaVu Sans. Personally, I'm not a fan of DejaVu Sans, because the uppercase 'i' and lowercase 'L' are too similar. I wanted to check to see how the default font stacks up to it by comparison before I started playing, but on that settings page there's no change between the two. Maybe the settings page just doesn't use the font being talked about? But it does change if I switch it to OpenDyslexic, so that seems unlikely.
It might also be that it's using my system's fonts, and I don't happen to have the font it wants to use as the 'default' choice, but I do see a file called 'fonts.rpa' in the game's directory, so I'm really uncertain of that.