I played this through to the combo keys being played area. I am really digging the concept here... and the art and music is really great!
I feel I need a little bit more story here occurring in the gameplay... I didn't feel I was in danger of playing moral/immoral music at any point and wasn't sure where this dynamic was being presented. I mainly felt I was trying to keep up with the notes, and it didn't seem to matter if I played them alot or a little as there was no penalty.
I feel there's definitely a fuller game somewhere in here that would benefit from the challenge presented... whether the devil is more interactive and giving you challenges, or a congregation in the background is getting upset when pop music comes though... I also feel the gameplay should allow you room to play moral or immoral music in some way as a strategy... do I play the devil's music now to get ahead, but risk losing my congregation? Or do I go with the safe chords and then have the devil swoop down and break a key permanently, or something like that?
Very nice work overall!