The feeling that hits, and eventually engulfs one, after they finish
the game: Horizon Zero Dawn.
This mainly is due to the fact that the world of Horizon Zero Dawn is so immersive that a person loses themselve in it.
Finishing
the game, and not knowing how long one has to wait for a potential sequel, makes them not want to play anymore.
It is not helped by the fact that no other world, coupled with its beautifully detailed ambience will ever come close to providing the
perfect experience.
This leads to a type of depression, which eventually leads to a person putting his gaming career on an indefinite hold, until the sequel is released.