Great program, but has detrimental bug

Downloaded this, and went immediately to the hiragana sets, but soon realized I could not return the main menu. The button
that would direct you back to the main menu (the button seen in the screenshot pictures on the upper left) was completely missing. I was of course unable to access the rest of the app because of this. When this bug is fixed, I will download it again.

yutori19 about iKana - Hiragana and Katakana, v1.4