I actually liked this game and was disappointed when I reached the final battle in the classic mode. However, I then faced the massive bug that any one of the Dark team members mirrored could never be completely killed, i.e. their picture would disappear upon dying, but they still get their turn to inflict damage on me, without any possibility to hit them anymore (since they're dead already). Killing the other enemies did not result in victory.
I even registered just in order to be able to place this comment since I could not find it in other comments.