Ah OK I understand now. The mathematical analogies really help. Here is a question then: You said that under Game Theory, nature is counted as one of the “players.” Could the emotions one feels when playing the game also be considered another “player”?
Here is what I’m thinking. The emotions you feel when, reading a visual novel for example, cannot be controlled by the author. But truthfully, they are not really controlled by you either. You cant really say: This game/VN is going to make me feel sad, no matter what. And if you were to play it again, you could once again not guarantee that the game/VN would make you feel the same as the previous time. In the same way, no other person when playing that game/VN will feel the exact same way you did.
This also relates back to @Bonecuss’s idea that:
In fact, now that I think about it, if you go by what we all seemed to agree on in the Is There Real Meaning in Visual Novels Discussion, emotions felt during the game are pretty much the effect of nature. Nature in this case being each person’s sum total of individual and unique experiences throughout his/her life leading up to the experience of the game/VN, causing him/her to feel/think differently than any other person.
Sorry Im getting a little abstract here 
