Coming here from wordpress.org's Codium preview page. Regarding the latest Codium version (1.0.9), what happens to the menu bar between the logo and the content when the viewport is narrowed? This happens in both the preview available on wordpress.org and your own preview to which you link above.
I tried 420px width and there's no menu visible. Or should it appear at the bottom of the page, but the preview just doesn't have it?
Otherwise a great, simple theme, which I particularly like for its ability to scale down for mobile devices. I'd very much like to start using it, but the lack of a menu in the mobile widths makes me hesitate.