Well, I actually like the layout. It's very clean and easy to use. A lighter look would be more of a draw for me. I'm just not into dark - when you get as old as I am, dark is really hard to read. And that's fine, though, because of course, I could always grab your theme and make it fit "me", since I do webdesign myself and changing the colors etc in a wp theme is no mystery to me.
That's the thing you want to key on: flex. You want your theme to be able in essence to be all things to all people. You want to comment your css so folks can easily see where tweaks are able to be done without harm. You don't want your font sizes to be so solidified into the way the theme displays that no one can increase them without seriously borking the theme.
Fine line and balancing act.... but y'know, wp themes are one of the most fun things around!
[Yankees, Dodgers, Cowboys, 49'ers.... they're mine, I love them regardless.... grew up through the 60s on them and will never give them up....]