This has potential, however I would make a few suggestions:
1. Add a playable keyboard to the to the 'Play' UI, for those (frequent) times when we have our phone and wish to practice, but don't have an actual instrument handy. Walking, commuting, at work, at lunch, etc... pretty much most of the time.
2. It needs a setting which prevents sleep mode.
Put those features in and this has a shot at being a 5-star free app.
3. Tighten up the instrument listening functionality; it's too sensitive at the moment, and too many correct keypresses result in credited mistakes.
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ETFanatic
Ima.P.Cee
Chris Houser
