I was able to breeze through this in about 20 minutes. The vocabulary is very basic non-medical and only about 40 or so nouns. Functionally it worked just fine, although its appearance could lose the "weekend hobbist" feel. It would be fine for a true beginner, but it really needs a larger word list if it wants to keep utility beyond that.
Pictures are a bit vague, especially the internal organs.
Simply the best.
gut
I like it
Sehr schön und super app
Very helpful and enjoying learning from this app
seher gut
wow
very good