Nice! I like the default aesthetics!
Btw, is there a succinct comparison to GraphViz?
GraphViz is perheps a little tedious to write, and takes some work to make look good (which makes me appreciate the D2 style), but is also definitely possible in my experience.
E.g. SciPipe (https://scipipe.org) outputs pipeline diagrams in this style:
https://www.researchgate.net/profile/Samuel-Lampa/publicatio...