I have a few recordings of the prototype here- under "All the Way Down": https://beyondloom.com/games/index.html

If it really piques your curiosity, I might be able to dig up the demo build I distributed to a few colleagues.

Oh, and another feature that isn't really shown off there is the manual- all of the examples can copied into an editor buffer and then tinkered with directly at the REPL: https://i.imgur.com/CwCaLY5.gif