I love the design of this, but I ran in to a few pretty severe issues, first, my save consistently breaks shortly after my first book is finished, and this happens on every browser I've tried, also, after breaking, the emergency save also didn't work.
Also, I ran in to pretty severe stuttering on the page viewer while I was trying to type, not impossible to work around, but certainly feels pretty bad and lowers my accuracy. Third, autobuy seems to just waste unlock upgrades and not give you anything, including readable books, and themed sentences.
Finally, while I'm able to import custom pages, it seems I have no way to actually generate a custom page? I could just be ignorant on how its done but I couldn't figure it out.
If some of these issues get fixed and some general polish is added, this will hands down be the best typing game that I've played. Seriously great work on the design, even with those issues I felt compelled to keep trying to play, and I'm really looking forward to seeing some of the play-ability issues cleaned up and hopefully to play on desktop sometime soon, keep up the good work!