I don't think there was anything insanely unique about the original D:OS graphics in general either -- mostly character design, sounds, and the sort of goofy vibe set it somewhat apart from the standard RPG look.
It was recognizable. Now it is not. The specific cartoon flavour is out. Generic look in. I talk about art. The UI is obviously provisional. Anyway full bottom bar of quick slots is a good idea, maby make it dynamic lenght so it starts short and automaticly stretch +1 one slot when full.