It isn't anything new, but it is an interesting idea, a beat-em-up where you beat up nuns isn't actually heard of from what I saw, I am a fan of beat-em-ups and I think this idea could be expanded upon, including a deeper story and varied and bigger levels, you could also benefit from having improved animations because while the art style isn't bad, the sprites float, and that's not a good thing, it also feels too much like a demo but I understand that considering that it is your first submission.
I believe that you have a good idea, and I hope that you can expand upon this game with some amazing features.