Hadn't you already submitted this before? The only difference is the audio.
It might be better to just add the alternating song into your already existing submission as a separate option.

deffinitely potential for an extended film. good character line up. music was good. visual effects are pleasant. well put together.

+2 nice flip book art, very simple but very effective
+2 nice story, seems like a trailer for something.
-0.5 really scetchy, could have used some more work.

But It looks like you have the potential to become really good.
Keep trying. Never give your dreams up.

The words that come to mind are imaginative and artistic. Keep it up, I hope it to see more in the future!