This looks excellent a nice restrained effort. Hasn't fallen into the trap that ActionScript3 did with too much ceremony, and its nice to see a syntactic super-setting approach rather than Dart's.
* Subract: Removing parts of the language - let crockford free to rip out the bad parts.
* Enhance: Bring in some more taste of Scheme.
* Replace: New scoping for var etc, without introducing new keywords.