That looks really cool, but it's missing the one feature I want most from anything that runs a sandbox (or any security-related software): I need something which a billion dollar company with a professional security team is running in production on a daily basis.
So much of the solutions to this stuff I see come from a GitHub repo with a few dozen commits and often a README that says "do not rely on this software yet".
Definitely going to play with it a bit though, I love the idea of hooking into Apple's Hypervisor.framework (which absolutely fits my billion-dollar-company requirement.)