I'll update the glow and I'll think about how to improve the bar.
I agree with the scrolling and I will introduce tab groups next update. The current "Building" tab is basically a "all buildings" tab and unlocking research will show category tabs e.g. "Research" tab that shows the research buildings and the available techs.
But I do like the "arrange the buildings at the bottom and make them scroll horizontally" idea. Especially as it would be very similar to Void Grimm (where the cards are arranged horizontally at the bottom of the screen as well).
Thank you very much for the in-depth feedback!