The POV was thought about in the development phase of the demo. It came down to a few factors:
1. The writer's experience was writing in the second person.
2. The use of "I" at the point of planning the writer thought it might cause a disconnect, as it implies the character is the player, but the character does not talk or choose things the same way as the character, so it didn't feel suitable.
3. Then there was the option to go third person which at the time felt like it was against the goal of having the player feel like they are int he adventure, but recent reception seem to indicate people don't mind a third person perspective, but it's too late to change now.
4. That's why second person was chosen as the middle ground of not too immersive and not too little immersion.