It's about 49 characters, which is maybe a little small but much closer to the size I normally read my ebooks at then most website these days. Most recommendations I see online for digital prose line length recommend around 55 characters at the lowest, so I think it's doing okay.

I can’t read the Hedgehog Review on my phone either. It’s the combination of the small letters and font. HN has a similar width of characters, but the font is legible at that size.