Definitely a HUGE flaw with this game.. I'm on the final boss (playing on hard) and all my characters are at like 30% health... How am I supposed to beat him?? Such bull..
It's too bad that the game encourages you so much to have fun playing to your own music, yet the hard achievement still forces you to grind the same song over and over..
For those who need help with the new/updated level 7.9 --- Stars 1&2: http://img838.imageshack.us/img838/9947/screenshot20110930at101.png --- Star 3: http://img217.imageshack.us/img217/2395/screenshot20110930at111.png --- Hope this helps!