It's a fun game but it has problems. Mainly the fact that the hitbox of the trees is atrociously large and makes dodging the bullets too difficult if there are too many trees or police in the area. And if an area has both a large amount of trees and police at the same time then it's game over as it's pretty much impossible to dodge anything!
Edit: Also Tracytron is right, droning someone should give you invincibility frames because police like to group up, and if there are enough of them in a group they will eat through all your lives before you drone them all!