For a start, very few of the stars onscreen get to full size, and the star circles are only 1 colour, so i'm fairly confident an A500 could cope with that easily.
Secondly, where the stars are generated from the centre is mostly garbage, so could be disguised with a simple anim in the centre instead of plotting lots of stars in the centre.
The shadowed sine scroller has been done to death on Amiga.
The copper bars in the background I think on A500 could be very nearly replicated colourwise, but on AGA could be done 100% spot on.
A combination of copper bars and real graphics reloaded with colours should give you most of the steps that are required to get a close approximation to that in that fake cracktro.