With Sphere you are encouraged (but not limited) to use the demo as a starting point for your own Sphere powered game. This makes it easier when you have less experience with programming. I could for instance just replace the level model with my own model to make it look more personal visually.
Guess if you are experienced programmer, glancing at Sphere_doc and the demo files is enough to do your own levels in the future, without having to reverse engineer the demo level or reading a step by step tutorial.
