You can encounter Portals leading to Bonus World during the Run.    

Within this space, you get awarded a lot of Coins, you can also gain Powerup and Essence there.  

Pet, Combo, and Power-up durations do not time out in Bonus World.

In Bonus World, you cannot die, isn't it great?  

After the bonus time is up, you will be safely inserted back into the regular Run.