Hey, love the game. But I have three suggestions.
1) When the player changes forms using the number keys, can you have Naija actually sing the song before changing? Like, if the player presses 9 (or whatever) for the energy shield spell, can Naija quickly sing the four notes required to cast the spell? This is mostly for flavor reasons, I guess.
2) On the song screen (where you highlight one of your songs and the game shows the notes), can you have the game trace the notes as they're played, showing how you would "draw" the song using the mouse?
3) Can you change the controls so that a game pad's d-pad can be configured to activate different forms? On my controller, the d-pad is treated as a hat switch.