The UI was at its peak in 3.0. 3.0 with slight balance tweaks, finished Subspace, and the Event Mode revamped would unambiguously be the best version, but alas these game designers tried to become graphic designers and ruined the menus in the years to come. Most of the later costume and stage additions look bleh for the same reason; I'm not convinced this didn't play a role in the death of this game.