Bit of bait-and-switch here: thought I was learning about a new programming language when it's more a pitch for books about making programming languages. Creative advertising on the part of the author though!
A little bit = but personally happy to see a website for the language - there are a lot of implementations out there now ,so its good to have a source point.
If you have not read the books they are a really good practical introductions to building interpreters and compilers.