This doesn't look sufficiently different to JavaScript with JSX.
I don't think this is for me, but it's an interesting experiment and I could immediately grok what it was doing.
You're right the familiarity is a good thing though - just look at TypeScript!
Fair point. I think there's a tradeoff in there somewhere. The fact that you need to do things like wrap JavaScript in order to use it within Mint sets off all kinds of alarm bells for me. I still like the concept, but justifying an entirely new language (to myself, to my higher ups, to the company at large) is a high bar.
So yeah it isn't bad if it looks similar to something lots of people already use.
The first thing I thought was that it reminds me of Svelte, which I have been using and like a lot.
Like you, I'm not sure it's for me, but I also think it's interesting.
It does look like a cleaner and more convenient coding experience.