I know 4 languages. 3 of those I learnt because of my family. I learnt Russian because of work (+fun). I feel that it is always best to go the classic route and learn a language from a manual (currently learning mandarin from a manual) and that gamified experiences of learning languages have a very low learning/effort ratio.

You can use the classic route in my app. You can browse Kanji characters sequentially and memorize them.

I agree that over-gamified experiences are detrimental. That's why I try to build features that help people immerse themselves in the language.