Author here. Yeah the syntax looks much better with correct highlighting. I've provided a custom definition for Notepad++ on the repo - and of course there is the definition used on the website too.
I'm also a big fan of DSLs and would love see some of the things you mention. My next (fun) big project is actually not so far from the same lines ;)
Many thanks to everyone for the kind comments! It really is encouraging. :)
If you would like to take on something that is genuinely lacking from C, try creating something equivalent to C++ templates for C. I'm not sure that it can be usefully accomplished using only the C preprocessor. The C preprocessor is extremely underpowered. So it might require its own preprocessor.
I wouldn't make them exactly like C++ templates. I'd just focus on the useful things that you can't currently do in C, like write a qsort()-equivalent that doesn't suffer the performance penalty of callbacks. You can almost get there with macros, but not quite -- it would be ridiculously ugly at best.
I'm also a big fan of DSLs and would love see some of the things you mention. My next (fun) big project is actually not so far from the same lines ;)
Many thanks to everyone for the kind comments! It really is encouraging. :)