That Bowser's castle level sounds awesome! Plus they could remix the old castle theme, or if the level is supposed to look 16-bit, they could just use the original song. They better have music that, measured in goodness, surpasses SSBM. And they must keep the same Great Fok level, be it traveling through Corneria or Sector Z. Maybe in the background of that level, you could see the landscape of a level like Zoness, then the background would move away so it'd be just space for a while, then the background of a different planet level would come in! Like Titania, Corneria, Solar, Zoness, Macbeth and Venom, and then back again.