Good, I have some notes.

This app is good ,I recommend it. However there are some things I would like to be changed. (I only speak about the Korean language part of the app)
1. It gets to hard to fast for example the first lesson you learn how to say good morning then in the second lesson part 1 you learn how to say what is your name. Thats to much, and if you learn like that we cant break down that sentence so we will be able to say each word in the sentence.
2 the bloon game needs to also have the English pronunciation not just the writing in Korean because in each lesson you do not learn the writing part in Korean so the bloon game is not useful.
3 the three short test on each part are a great way to learn but you need to change it where when do the arrow test you can choose between moving arrows or no moving arrows. This would be helpful in learning.
4 your app does help people learn languages,but not fully. Your app would become greatly more popular (probably) if you also had a lesson on the Korean alphabet,Hangul. That way they could learn not only to speak the language but also be able to write the language. That way they can fully know the language.
5 learn one word at a time not one sentence.
6 add more game options.
7 update your app when possible to add more options and more words.
8listen to the reviews because reviews are commonly unread but have good ideas.

If you read this please listen to my ideas/concerns. Thank you

Elizas swag about Learn&Play Languages Beginner