And now for my feedback.

2 things I see missing, but are probably a rare case. Doesn't appear that the "Arcade" system has been designed.
And second, I've created folders for collections of games within a system. Like I've made myself a "Favorites" folder, a folder of games I used to own, and a folder of the games that are included in the NES Classic Edition. While I've named those folder "01 Classic Edition" so that it will sticky to the top of the list, would be cool if there was some way to differentiate a folder vs game. The default theme changes the color of the text for folders slightly. But could be cool if an icon could be added before the text.
Just my thoughts. No big deal or deal breakers. Thanks for all the work you've put into this theme @RxBrad!