Christopher Ray Miller: I notice that three click symbols (two between the voiced pharyngeal fricative symbol and the dotted O for a bilabial click; the other the rotated minuscule t preceding the stretched retroflex t symbol) are old symbols deprecated since the Kiel convention and replaced by || and ! and | (interdental) or superimposed = and | (alveolar). Small market segment, but those wanting standard IPA click symbols might forego this font for that purpose despite its other merits.
I am relaying a comment from Facebook relating to the web demo: https://psb1558.github.io/Elstob-font/ :
There is a relevant paragraph on Wikipedia in the section "Letter Forms", second paragraph: https://en.wikipedia.org/wiki/International_Phonetic_Alphabet#Letter_forms
https://en.wikipedia.org/wiki/Dental_click https://en.wikipedia.org/wiki/Lateral_click https://en.wikipedia.org/wiki/Alveolar_click
The concerned Unicode points are U+01C0 to U+01C2 (or U+01C3).