What does it do?
It demonstrates how one can move the camera round, by keeping the cursor close to the edges of the window.
For doing so, it created a green background. This way, you'll notice the moving.
What are important aspects of the code?
This line is key in this demo:
game.AddSystem(engi.NewEdgeScroller(scrollSpeed, edgeMargin)), to enable moving the camera around by using the edges of the window.
There is no documentation for this package.