I am now working on the 3rd module of the Hindi course, so I've tested the programme a fair bit. Hindi must be about the 20th language I study, so I have some idea of what learning a language is about.
While I enjoy the app, the format, the light-heartedness of the dialogues and voice actors, I am frustrated by a number of things.
First of all, there are too many typos for a language course. As a learner, I shouldn't be left wondering what's going on, only to realize later that it was a typo. There are too many weird things happening, like odd or irregular translations, plurals instead of singulars, the female voice actor reading a first-person response in the masculine, etc. All this gets in the way of the otherwise fun topics and voice actors. It adds confusion to an already difficult process.
Second, I disagree with the general principle that the student should just repeat without understanding. I'm fine with putting emphasis on the carelessness of "just repeat and you'll eventually get it", and it does remove pressure from the student to perform, but there are grammatical questions that need to be explained (even with some simple additional written material), and to leave it to chance, frankly, just feels lazy.