SaintGimp/GenesisEngine ? reverse-engineered prompt

Build me a small C# game demo where I can fly around a procedurally generated planet and zoom from ground level all the way out into space.

I want it to feel like an exploratory sandbox, not a full game, just a world I can wander around in. Make the terrain generation interesting enough to look different in different places, and let me move with the keyboard and mouse, including going up and down, changing speed, zooming, and toggling wireframe view. It should open and run cleanly in Visual Studio, and if you need to look up current MonoGame setup details online, go ahead.

Keep the camera simple if needed, but make sure I can inspect the planet from orbit and also get close to the surface. If there are obvious places to add nicer visuals later, like texturing, stars, or atmospheric effects, leave the code in a way that would be easy to extend.