randomly saw your comment and thought i'd answer. i would imagine corresponding to the theme of the game as i understood it it's getting forever lost and dissolving your identity in the labyrinth of the thoughts about the past life you've had and never getting out. becoming one with the lost innocence of a happy childhood like, perhaps, many people before (nika states she has a large family that lives in this ephemeral world lera finds herself in). the way that is achieved in reality could be taking ur own life, or perhaps, like lera wanted to do at the beginning of the game, just driving forever wherever until her car runs out of gas and she succumbs to the cold.