Are you aware that your Github README doesn't actually tell us anything about Roc is or why we might be interested?
This might be on purpose given the first words are "Work in progress" and "not ready for release", but linking as above does lose some value.
Instead of being rude, consider checking Roc's website: https://roc-lang.org/
He wasn't pitching the language directly, but linking to the codebase as that was what was relevant to the comment he was replying to.