Hello, Dan!
A few years ago I bought Universe Sandbox and I thought it was great. I also have a love of programming, and I hope I can work for Mojang or some other video game company.
So, you program in C#, in a managed .NET platform. I wonder how many FPS I would get if this was written in Java? (I program in Java).
Do you use a game engine? Unity?
If you port the Sandbox to MacOSX, what language would THAT be in? Still C#?
Sorry to pester you with these questions.
Curiosity killed the cat.