This is the home of a Ludum Dare entry. It involves cats and water and saving them.
I obviously didn't take time to fill this out, sorry!
It was built largely with this: https://gh.nes.science/nes-puzzle-maker-rom
Using this tool: https://puzzle.nes.science
Game code changes are in this repo, and there should also be an exported piece of json in the rom directory that can be used to play with the game in the Retro Puzzle Maker ui. (If I forgot this, remind me! I'm sure I still have it!)
The new data is applied via a patch exported from the puzzle maker, in an ips file in the rom directory. The final rom will be the result of applying the patch to the rom and saving it.