The steepness of the serifs on E, F, L, T, Z seem a bit out of sync with those on C, G, S. I would make them all the same, maybe also the serif on the inside of the G. Digits 5 and 7 suffer from the same steep serif problem.
If you're willing to edit a few styles to enable features that you need, e.g. Small Capitals in headings, Ordinals and/or Alternative Fractions, etc., in Body Text, then it is not difficult to apply those styles to text as required.
I have added a few notes to my review page for LibreOffice to get non-geeks started.
Hopefully, within another year or so, someone will volunteer to do the necessary work to implement a GUI to make this more convenient to use for ordinary users. Ordinary users think that the Private Use Area is something entirely different to a set of code-points set aside for OpenType Glyph Substitutions or whatever else the font designer might want to use it for.
Most of my free fonts include both Small Capitals and Petite Capitals, as well as c2pc and c2sc features. I design Petite Capitals on the x-height, and Small Caps as 70-80% of the Caps Height. You could mix Caps to Small Caps (c2sc), with Petite Caps (pcap).
Glyph coverage includes Latin-1 Supplement, Latin Extended-A, and some of Latin Extended Additional. Fonts with Greek glyphs also include Small/Petite Capitals for Basic Greek.
My Petite Capitals have a squarer aspect ratio than Small Capitals. The general principle being that apply Petite Capitals to lowercase should not change line length too much. Small Capitals are similar proportions to Capitals.