The reason I think a Sburb Rougelite would even be fun is because you could make the enemies progressively stronger and tougher by prototyping them, there could minibosses holding loot that hide lore to the world and stuff, doing quests for some NPCs that require you to slay some ultra hard boss that sets the tone of each players planet seems like a really fun game and also I just really fucking love rougelites.