Have you read the instructions on what args you can use? The message says the problem is "-bits", try to get rid of -start. Either use bits or start:end.

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Really interesting, I was kind of looking for something similar having colored 3D view of points,  something in the vein of mandelbrot rendering.

Surprisingly using some of the points as G, makes some unique shapes,  for example,  having n/2 public key as G and viewed in "polar" makes interesting lines,  I could also see Fibonacci's patterns.  Here try these points as G and set start to end at 1, 99. Though you should try different ranges both in polar and 3D view.
Maybe we could find correlated connections based on each point differently, like e,g.  Having all the points generating spirals under one category, points generating triangles under one category, etc. Let me know what you think.