This was an early stress test of the Cause programming language, using a couple of Advent of Code 2019's puzzles as a test case. (this project was written in 2022; I was using the 2019 puzzles just because I hadn't gotten very far in that year before and, er, still haven't).
It even has some visualizations!
You can run it with:
gradle -q --console=plain run --args="-r cause [day]"
(available days are 1 and 2 - and day 0 just has some hello world stuff)
Files in the cause directory are watched for changes and hot-reloaded, so you can mess with the language that way if you want!