It's really exciting to see that there's still interest in this little game Greg and I made all those years ago!
I wrote up a postmortem on Untrusted back in 2014 that may be of interest if you'd like to learn more about how the game was created: http://alex.nisnevich.com/blog/2014/10/17/some_words_on_untr...
I'm happy to answer questions and help anyone's who's stuck and needs a hint, but it seems like the HN community has already been doing a good job of the latter :-)
I'm still experimenting with the fascinating intersection of code, games, and language. Here's the latest thing I'm working on in the area (albeit in a very different vein, and still very much a work-in-progress): http://app.wordbots.io/
Alex
P.S. I though I'd end with a shout-out to some super-cool games by other people that have been inspired by Untrusted: - INJECTION by TOASTEngineer: https://schilcote.itch.io/injection - Programmer Adventure (interface in Russian): https://programmeradventure.github.io/