Thanks! And sure thing, I have a GitHub repo of all my PICO-8 games, but here is the source file for this one specifically https://github.com/CaterpillarGames/pico8-games/blob/master/carts/hamster-slam/h...
PICO-8 stores a lot of binary data in .p8 files (if you squint, you can probably tell what they are!), but the __lua__ section is what's relevant. The names of builtin functions are pretty terse, but the wiki has some pretty good documentation https://pico-8.fandom.com/wiki/Pico-8_Wikia