Hi there, thank you for the kind words!
I’ve just published an update (v1.3) that should improve some of the glyph support in the body text, and added a “missing glyph” symbol for headers as I see they were just quietly dropped.
This hopefully improves readability for the main text, though I’ll have to figure something out still for the headers and blockquotes (italic fonts), as those only really cover the basic ASCII ranges.
Regarding QR codes: This is something I experimented with in the past, but found that the Playdate took a very long time to generate them which wasn’t a great experience overall.