Whoever wrote this didnt really seem interested in making it useful. There is no way to select cards for your review based on your current progress in Genki. Instead, one picks sets that cuts across material in more than one chapter. Also, when it comes time to check your answer, it gives you the verb ending, which is half the answer. My feeling about this app is that currently it is not of any use at all and when it might be usable I wont need it anymore.
Mr Yozhik about GENKI Conjugation Cards, v1.1.0