Dimensional rifts can be used to travel far distances in The Riftbreaker. You can build smaller rifts in your base to fast travel to specific positions. To win the game you need to build a big rift to travel back to Earth.
You can travel to a rift from any location on the map. Just press tab (to view the map) or the button on your controller. Select the rift (or your headquarters) and you will teleport there.
Place them all over the map, they are self-sustaining.