Wrote a little #fennel script to parse and create #bitsy game files using #lua:
https://git.sr.ht/~jummit/bitsy-format
It can convert between .bitsy and .json files:
parse-bitsy game.bitsy # prints the json
parse-bitsy game.json # prints the bitsy format
It's also on #luarocks: https://luarocks.org/modules/Jummit/bitsy-format