Congrats on the daily 3rd place!
Little bit of style inconsistency at times, but otherwise, it's really well done! I love the camera shots you used to illustrate what they were saying, they worked really well. Also, you're great at the magical girl style backgrounds. Adds that little bit of your own personal touch to the animation.
And yes, mermaid cop is a perfect addition - morally, comedically, and visually.
Edit: Understandable, and also wheeze! Okay, clarification, I meant in terms of art style. It works.