Nice idea, but you need a core engine first. Think of each block as a module with a strict interface—inputs, outputs, and state. That way the whole system can stay predictable, even when you start adding random AI or climate generators. Remember, a living sandbox is a puzzle only if the pieces fit together, not just fit loosely. And if you want true sci‑fi vibes, give your blocks a narrative purpose—why does this algae reactor exist? Then the evolution will feel like a story, not just random noise.