I had a quick test, but there's some work to be done here still:
- The collection menu uses onMenuExit without a menuIndex; this results on a strange menu animation when you enter a collection, exit it, and then enter it again.
- The favorites icon animation leaves something to be desired.
- The video/screenshot/artwork_front art doesn't scale within the borders; it's only got one parameter (either width or height) defined without a maxWidth/maxHeight. This results in video/images displayed outside the border, e.g. a vertical MAME video. You should use either width and maxHeight or maxWidth and height.