This app mainly for beginners in Japanese, its also for those who want to practice (read Japanese) and learn new vocabulary.
It has been developed to help and give you a new way to learn Japanese, to me the most important way: Practicing it !
The mistakes that you will encounter in this application are on purpose.
To learn a language, you have to work, look for mistakes and correct them!
Believe me if you do all this, you will learn the rules and principles on how to do sentences in Japanese (which is the hardest to learn) ...
After using this app, the only thing you will need to be fluent is to learn new vocabularies :)