https://www.youtube.com/watch?v=hCE_zcpNpnY https://www.youtube.com/watch?v=hCE_zcpNpnY The author made a video explaining the concept, at around 8:20 he write

https://www.youtube.com/watch?v=hCE_zcpNpnY https://www.youtube.com/watch?v=hCE_zcpNpnY The author made a video explaining the concept, at around 8:20 he writes a new "microprogram". It looks to me like he's replaced the idea of writing functions with writing keywords that extend language grammar. So eventually you'll compose all of your new keywords and be able to reason at higher levels of abstraction. It seems web-centric? He was using it as a kind of templating engine, and that would explain why it can execute JavaScript inside of a microprogram. If a microprogram can execute other languages or wrap native programs he might be on to something interesting.