This is a really unique concept and the idea is great, but there are things that could be improved:
1. First thing i noticed: Probably, you got most of the UI assets from the internet, but the tutorial UI can really be improved. Take a more fitting font and make it more fitting to the rest of the UI.
2. I didn't really understand the game at first, i didn't know how stopping the pedestrians should prevent them from getting killed by cars. But then, i releaside you could push cars, but that wasn't intentional. But i actually don't understand the whistling mechanic and would rather see a game where you push the cars.
I hope my feedback helped you, and it would be cool if you could check out my submission too. Thanks! :)