The idea is so cool ! I think that the funnier part is when you see someone doing something bad, your mindset is instantly "I just saw what you did ! I'm gonna catch you !!". Playing on that by adding some gameplay mechanics to "catch the suspect" more than just "Spoting who does an infraction" might be really fun, like the fact that when you spot a crime, and approach the suspect he flees or whatever cool idea you can find to add challenge in this specific part! I don't know if you agree with that ?
On the visuals part I like the general design but I think you could really have better visuals if it wasn't that blury overall. I mean that the pixel art is fine but if you have something more "high def" with very reactive controls, and some "juice" I would like to play it so much !
Please tell me what's your opinion on that ? Do you see something different ? Contact me on twitter if you go further in the dev of this game ;)