I love the storytelling between the two characters. Even though the journey is short, they have such a strong bond. The soundtrack and sound effects are also wonderful. And probably the best example of "Stronger Together" as they (the players) understand that the characters need each other in order to progress the game.
The major issue I can come up with is the introduction of the enemies. Not the most proper way to show the player that the machines could kill you, in my opinion. Maybe have a cut-scene showing a machine killing a human running by its path.
Overall, amazing job!