Hi score: 182 + rollover???
I like the concept! It's always nice to see a space-shooter style game go somewhere that isn't space. Actually I think this can be a totally different category given the crashing mechanic, I really got encouraged the more I played to move the car in closer to the far end of the stage, especially since the rate of enemy cars effectively increases while the rate of friendly cars doesn't.
I also have a suspicion that the score is only a 8 bit variable, since as I got better and better and felt like I definitely should have gotten a score higher than 182, I was getting super low scores like 17 and 35. Is it maybe rolling over if you get a score higher than 255?
It was also really difficult, though I don't know if I'd say that's a bad thing given the arcade style of the game! The reason being that often enemy cars spawn on top of or really close to friendly cars, so often it's hard to shoot one without hitting the other.
It would also be cool to have some kind of indicator of how close we are to losing, like a health bar or a number indicating how many criminals we've let through/how many friendly cars we've crashed into!
I'm also curious about some of the cars randomly moving up or down at the end, was this a specific move to discourage players from sticking to the back of the stage? It definitely caught me off guard. If so, it might be more fair to make those cars look a bit different somehow or give some indicator that they're the type of car that will make a sudden 4 lane turn.
Nice game though, it's simple but addictive!