In the last battle, I maxed out all the cards (in hand, in battle, auras) and it bugged out and just stopped. there was no action buttons to press and it wasn't the computers turn.
I don't know why people complain about the music so much, it's great, I do have it muted, but thats only because I play this game hours at a time!
Also, the game is hardly repitative! There's a new powerup every two levels average, keeps my attention!