You need to understand what perfect pitch is.

I see nothing wrong with this. It does exactly what the description says. I suppose the problem is that the game assumes a person knows what perfect pitch is (as in the musical term, not the title of the app) but the game is only really useful to people who understand perfect pitch anyway.

Recommendations:
1) add more octaves
2) maybe play a few random notes in between the ones you need to guess. The way it is now, the first one helps you practice perfect pitch, and after that it is more like training your ear for intervals than pitches.

Ongakujin about Perfect Pitch Free