Thanks Davidandsome for making this app.
I have an add-on for the desktop version of WK that lets me see context sentences during reviews. The context sentence usually increases my memory recall, and assists me in providing the right answer when I would otherwise forget the meaning or pronunciation and have to review the word again and again.
Have you considered adding something like this to your App?
Here is a link to the thread about the addon, in case it helps give you an idea of how it looks and works:
https://community.wanikani.com/t/userscript-wanikani-sentences/4795