Hello! I'm slowly making my way through the VODs after finishing my exam, and wanted to respond first at the bare minimum before the event ended, to thank you for playing! I'll answer a few of your questions and had one of my own.
Jost is the "pretty" UI font chosen by the designer, and Atkinson "Hyperlegible" is a low-vision font created by the Braille Institute, which is also visually appealing to everyone including folks with dyslexia. Here is a nice explanation of the font. The British Dyslexia Association has said that OpenDyslexic is not a peer-studied font, and also recommended other plain, evenly spaced sans serif fonts including Arial. Hence those were our final 3 choices of font.
The inner thoughts being casual was intentional and preferred by other beta testers as it made it more comical to feel the modern contrast, and allowed their brains to rest from the Middle English. My apologies it had the opposite effect for you.
What other choices would you have liked to have done within the demo's scenes? I'm really curious what ideas you had in mind ^_^