I guess you could see some similarities. Vely is standalone though, not an extension. And it is 100% C, always creating native executables.

By that I mean a direct native executable from either pure C or embedded statement producing shallow and performant C, without layers of other languages intertwined (because in the end anything is always a native executable even if it has layers of byte codes, interpreters, alone or mixed with native extensions).

But I guess from a bird's view point, I can see how all the impressions given here are correct. It does look somewhat like PHP for C or like a markup language, or a declarative language etc.

There's some truth to all of that to some extent.