I really appreciate the video, the help, and the full-screen mode.
A little better resolution on the video would help view the text more clearly.
Many users will wonder how to center things, including the whole menu bar.
While nested menus (grandchildren of the root) are apparent to me, they might not be to others.
From a visual design standpoint, I'm very glad you covered the need for readability / visibility, the need for good contrast. Enough contrast in light/dark (lightness), strong/weak (saturation), and hue is needed for people to see the text well, especially smaller text. Contrast in hue alone isn't enough: Lately, I've seen several sites (and several product designs) that do things like orange and light grey, or yellow-gold and white, or too little contrast in several greys, which are hard for the *average* person, and harder for folks with poor eyesight or in adverse viewing conditions. -- That isn't to fault your video, which was good to even mention and demo it. A later video might expand on the point. Or, a separate video on color usage might help new people who need help on design principles.
Good video, thanks much!
Hmm... What about adding icons or bullets or check marks?