Thanks for all the feedback and comments here, folks. It really is appreciated.
I’m not a professional web designer - this just started off as a personal project that I ended up publishing as people I shared it with seemed to like it.
I’m taking on board the various feedback from people much more knowledgeable than I here, again I really appreciate it.
If you do have feedback/changes I’d urge you to log an Issue or a PR on Github[1].
Also great to see so many other minimal CSS projects that I wasn't aware of. I’ll have to add an alternatives page to the site, I think.