While running you've to think fast and dodge the hordes of viruses that come towards you.
Viruses mutate taking other behavior in their movements, which makes you think faster.
The speed of the game increases every time you complete a cycle of all its mutations.
The force fields prevent viruses from consuming you in the event of contact.
Every 20 meters of advance you are given the opportunity to have a force field.
Police are not as fast as viruses but they have crazy movements.

Go as far as you can and break your record whenever you can!