This project has existed in some form or another since the latter half of 2021, with the technical research beginning right after I released my colorization of Pinball Land. However, the actual coloring work didn't heat up until late 2022, when I finally got the colorization groundwork (hooks in the code of the game, Python scripts to dump tilemaps/sprite data, etc.) good enough to allow for the detail you see in these screenshots.
With this, I'm aiming for a release sometime this year, however far out that may be. Still plenty of backgrounds/tilesets to colorize, as well as some sprites, so it's still got time in the oven. I hope this excites people, and I look forward to sharing more as this project gradually comes together.