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I was able to get it working, I think:

axiom: a

rules:

a = +b|-a|a-|b+

b = -a|+b|b+|a-

initial angle: 90

angle change: 90

scale: 1

simulation depth: 4

That did the trick - thanks! I couldn't figure out what the [] meant in this context and thought it was to make a recursive call.

(I've been working on basic space-filling curves, and came across that Wikipedia page last week, which is about all I know about L-systems.)

Wow never heard of space filling curves. Yet another rabit hole to go into.

Just posted my code as a "Show HN" at https://news.ycombinator.com/item?id=36762283 . The actual project is at https://hg.sr.ht/~dalke/rectfillcurve . I've implemented a few space-filling curves and wrapped them into an iterator API.