Having to use your score for everything you do is a great idea!
You probably already know it, but I think the lack of sound prevent it from delivering the full impact it could have. All the texts above the characters and the bullets on screen makes me want to hear the chaos it could become ^^
I'm wondering, why did you choose these controls? I mean, it works ok when you get used to it, but it's so different than any other games we are used to... is there any perticular reason for you to make this choice ?
The systems with the civilians and cops look really deep and complex, good job with that! But I don't feel like it impacts gameplay that much, since all you want to do in the end, is shooting the bad guys. But maybe it's just missing a small thing to create more engagement around these systems (like enemies getting stronger when you kill civilians, or civilians you saved giving you free upgrades)
I would love to see an upgraded version! I think it has a lot of potential :)