A planet builder that not only lets you build your planet, but let’s you add landscapes and features to make them interesting.
Un-Interactive Scenery: Launch pads,, runways, buildings, cantinas, moisture evaporators, roads, and other interesting features.
Interactive Scenery: Things such as bridges and boats like in simpleplanes, but with more options, such as health, and the ability to create a path that they would follow.
Visual Effects: The ability to give the planet events such as weather cycles and events, heat and cold
This has probably been suggested already, I did do my best to find it like this but I couldn’t.