This actually looks good. Though at this point I get annoyed at anything that doesn't make an effort to be compatible with Markdown - idk if there's any good reason they chose # as the symbol for introducing code lines, but surely it makes sense with the ubiquity of markdown to make that start a header. Similarly with * for emphasis and whatnot.

But it genuinely looks like a good effort to dispense with the backslashes and braces of LaTeX yet retain a coherent and comprehensive mathematical output.

What is surprising is that it doesn't appear to ultimately just call through to TeX. That probably means it has a chance of having good error handling and decent performance... I will have to give it a try.