I can't say much about the app as I haven't tried it yet, but my first impression of the web page are:

Who is this for? At first I thought it might be for doctors, to sort of "crowd-source" a diagnosis, especially from the phrase "investigate, deduce and diagnose real life in minutes." But the cartoon look and the word "game" suggest not.

Now I think it might be a "try to diagnose the problem" game for lay people (I mean, non-doctors). It does look like fun.

In the industrial first-aid training I've done, we practiced and were tested in various scenarios where we had to make a basic diagnosis and provide first-aid. If I understand correctly what your app is about, improving first aid skills might be an additional benefit of playing the game.