Looks fantastic! Now it simply needs a non-Scratch runtime and a Scratch-like frontend, and we'll finally be able to teach bootstrapping to the 5-10 year old demographic.
adazem009 has been developing an alternative runtime for Scratch written in C++ [1]. It even uses compilation to speed-up the performance of Scratch projects, perfect runtime for goboscript projects.
[1]: https://github.com/scratchcpp/libscratchcpp