I've updated a few aspects of play. Since many are playing this game in the browser on hand-held devices, I've made it so you just have to tap the sun character to jump. Before, jumping was done by tapping the slime character, but its hit box and location were a little inconvenient. Tapping the sun is much easier. 

At the end of the stage you can review all the questions you went over during that session. Now playing this game is a much better form of study. 

Finally, I've included the vocabulary section for free. If you want to start reading Japanese (hiragana and katakana), this will help you gain a reflexive ability to read and learn a lot of vocabulary as well. 

And of course, after you master reading hiragana and katakana, get started with kanji as soon as possible. Play Hop-Hop Evolution, Kanji 1000 when you're ready.