The NOVAverse games are each unique and interesting, giving a chance to fully explore different factions and viewpoints in a familiar, yet intriguingly unique, setting.  LUNA uses a diceless system and is focused on espionage over brute force combat, making for a completely different game from a powerfully different perspective.  For instance, the Sparks of NOVA go from being the Mighty Immortal Heroes to Undying Servants of a Dead Sun.   It's wild and cool.