Hey, I gave this a try. Everything worked as expected. And resizing windows didn't seem to be an issue, though I can imagine the text sizing could be an issue for accessibility, as word placement seems important, and if people need bigger text on a small screen, it might not work.
Regarding navigation, I have a few notes:
-My preference is actually to have all of the text on the screen, rather than go word by word. Having an option to show all would be good (one thing was just all the clicking was distracting for me)
-When you navigate to the next page on accident, and then go back, it starts the text at the beginning again. It would be nice if you go back, all the text is there (or maybe the above option would help with this)
The differences in backgrounds and font from page to page seemed a little weird to me, it almost made me feel like they were from different works. I realize you're just testing things out, but as you're thinking through designs, I think having consistency within a work will be important. The background doesn't have to be the same necessarily, but maybe evolutions on a theme. Font should probably stay the same though.
Anyway, just some thoughts, feel free to ignore if you want to go in a different direction :).