Hover’s gameplay is mainly based on movements and tricks mechanics. There is no fight or violence, you can’t kill/hurt someone or even yourself. But this does not mean you will not have any foes.
The city is controlled by a dictatorial system, a robotic police stalks resistant Gamers. Many security cameras and other security systems cover most of the streets and high grounds.

If you get spotted, a police drone can be deployed to catch you. Of course, you will have to flee or take it down into traps. If you get caught you will be restrained for a few minutes. But watch out, after several arrests you might be jailed and thrown in a high security prison you may have trouble escaping from.
So, as soon as needed, you should also hack one of the E-Cop antennas around the town to delete your criminal record and reset the arrests’ meter to zero.