Variable speeds of the police cars and some limited vertical movement of them would make it a bit more dynamic. Timed bomb mechanic is ok. Main thing missing is some goal, maybe a wave-based system?
You know, the mechanic is actually fun. It's not the first time I see a game using a mechanic like this, and it does work. Like somebody else said, with some polish and a goal to acompplish, you could have a winner!
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