Sounds like a re-invented wheel:
Ten years ago...
"BASIC" is a language with enough looseness in its specification that you can release implementation after implementation and not be a "re-invention" or derivative. (In this case "It is a modern reconstruction of the original BASIC interpreter written in 2012 for the STM8S platform", a version I'd never heard of.)
(and reinventing exactly PICAXE for AVR would arguably be a good thing, IMO.)