I got to 29 on that now, and it sure is one ugly machine. I think I see the principle for how to do it in ~20, but not sure I can actually execute it.
On the other hand, the top percentile score (which you can see by turning on an option after beating the campaign) is 25. Those are usually pretty solid, I’ve only beaten the top percentile on one level, and then just by one cycle. So odds are that I’m totally off-base here.