This is outstanding, personally I would immediately switch to it if it was an addon for zsh instead of a standalone new shell.

While I'm spending quite some time in my shell and the extend that its a core part of my system is quite considerable and makes switching to another shell altogether a huge time investment.

Nonetheless, I'll always keep an eye on promising alternatives and eventually switch over once the functionality missing gets apparent enough on a constant basis as it happened for me when switching from fish to zsh.