Thanks to @neauoire for mentioning the Langjam Gamejam in their #DecemberAdventure log (i think that's where i saw it), I'm now excited for this upcoming 7-day challenge/jam to build a programming language and make a game in that language in the 1-week time period.

https://langjamgamejam.com/

I have many other things "i should be doing" instead, but this will be fun and I think I'll do it. Not yet 100% sure, but i might implement a forth in lua again, and/or build on top of L5. I've also been meaning to write a BASIC interpreter, so we'll see if i pick one of these up and run with it.