There are two main reasons the project was abandoned:
either without a complete rewrite.
As stated above, the source code will remain for anyone who is interested.
For posterity, below is the original project description and roadmap:
0.2 - HTML context builder and reflection extraction from PhantomJS - done
0.3 - Reflection to XML conversion - in progress
0.4 - SHFB plugin
0.5 - SandScript installer
0.6 - Test and refactor
0.7 - SandScript documentation
1.0 - Release