I am having a great time reading this story so far!!! I am so glad that I started reading this!
The only suggestion that I have is maybe altering the grey borders around the text, I feel as it makes the words appear more blurry which causes a bit of strain on the eyes, maybe at least for the "Open Dyslexic" and "Base" font settings as those are often used by people who have vision impairments and dyslexia!