Still not finished unfortunately :( Guess Steve is currently busy writing the next big thing in programming languages (https://steveklabnik.com/writing/thirteen-years-of-rust-and-...) ?
Nope, I have had zero time for personal projects lately, Rue is on the backburner until I do.
I've been busy at https://ersc.io/ (and spending time with my family, and playing Marathon...)
It hasn't been touched in 3 months: https://github.com/rue-language/rue .
To be honest, while Steve's tutorial was what got me interested in jj, other tutorials were better in actually helping me understand it.