You're on the clock. You have 5 seconds at the beginning of every round  to get to the portal. You don't have time to get to the portal, but you've got options: 

On the first level, you will be shown all the components: - Portal: the method to proceed to the next level. Run through it!

- Lever: A device used to open the portal. There may be multiple per level. Click it!

- Timebank: An item that will add a few seconds to your time. Jump on it!\n

When picking up a timebank, you unlock the ability to start the level over. The actions of your previous run will be performed again. Press the [E] key to rewind your events. So, if the room requires you press two levers, but they're too far to reach in time, you will need to hit one lever, rewind, and hit the other. Once both levers are pressed in time, you will be able to proceed. Best of luck :)

Source (and releases)

https://github.com/dsgallups/rogue-time