I am! I paused working on it so that I could do other stuff, but it is on the backburner. I think after the next update, I'll be working on it again (so like a month or two).
My cautious estimate is that we are about 30% on the way to JSON-based modding systems for monsters and items, and after that I'm interested in moddable levels as well.
You can see the latest progress here (just before I started on the October update) on a guy I'm creating that uses the in-construction modding system for monsters.
Hemicranian Pt. 4 | Patreon