I've studied out of most of the well-known Japanese textbooks, and yours looks really promising. You've even added a new learning mechanic with the English para

I've studied out of most of the well-known Japanese textbooks, and yours looks really promising. You've even added a new learning mechanic with the English paragraph containing interpolated kanji. I'm really interested to see what kind of mental associations that type of reading can build. Good luck with your launch!