I think the best thing to do would be to provide periodic asteroids or rocks that go across the screen every now and then---it's very difficult to get a sense o

I think the best thing to do would be to provide periodic asteroids or rocks that go across the screen every now and then---it's very difficult to get a sense of speed with a repeating star field, not even including the fact that this wouldn't happen in the first place. Since the starfield was periodic, it looked to me as if it were staying still or moving backwards at times (the wagon-wheel effect[1]) :( [1] http://en.wikipedia.org/wiki/Wagon-wheel_effect http://en.wikipedia.org/wiki/Wagon-wheel_effect