Hi, I'm the author. You're right about the resemblance to CoffeeScript. I added some recognition at the bottom. Thanks for pointing it out, I just got the site up within the last hour so there are still finishing touches to be made.
I am curious about why didn't you just implement the CoffeeScript syntax outright? Learning just one syntax would make it easier for people wanting to deploy to JavaScript and to Lua.
Imagine that C on the PDP-11 had a slightly different syntax from C on x86, and the syntax were different from that on C on ARM, etc.