I've been learning Japanese for ~3 years and tried a variety of methods. Of course there are better and worse ways to learn, but to me the most important factor is keeping my motivation up.

Without having read this book, congratulations on putting it out. Making anything is hard. It's nice that you're trying something new (at least to me) with the embedded kanji in English.

As part of my learning process, I decided to make a mobile app for learning kanji. It was quite a technical challenge for me to figure out how to let users draw kanji based on SVG in Unity -- I had to write my own SVG parser + renderer. Sourcing quality data for ~2000 kanji was also tough. If you want to check it out, it's free on both iOS [https://apps.apple.com/us/app/kanji-book/id1532844605] and Android [https://play.google.com/store/apps/details?id=com.bmalicoat....]