Very interesting! We actually use the system fonts. I.e. Openland is set in San Francisco on Mac/iOS, Roboto on Android, and Calibri on Windows. We do this to minimize distraction of an unusual font.
On column width, I am curious, what device and browser size have you used? Many of our users use the desktop version and resize it to the proportions they like.
On column width, I am curious, what device and browser size have you used? Many of our users use the desktop version and resize it to the proportions they like.