I have been on Memrise since 2015 and I have been a plus user for nearly as long as well. There are a small handful of minor things you (Memrise) can do to greatly improve the function of the web app as a learning tool.
-add a toggle for web users at least to disable typing for audio review
-fix the formatting on test so that answers are not cut in half because the word is too long
That is it. Really that is it.