We need to make Marvin sit in the back of a car looking outside and seeing white trees (and some fog (optional))

The player going to a public toilet next to a gas station, if executed great that can make the player feel some strong emotion.

ACTUALLY IMPORTANT ONE: so in the first half of this game Marvin will kill people with no hesitation because he knows he is in a simulation, and he THINKS that the people around him are just code, and nothing else, but when he finally gets in the real world, he realises that all the people that he ever saw were real people trapped in the same simulation as him. And much more the life in the simulation is tied to the life in the actual real life, so if somebody dies in the simulation, they die in real life. And also, to make this story a little more interesting, we could say the the whole scope of the “simulation experiment” or whatever is to see who manages to survive, but oviously we know that at the end Marvin will go back in the simulation, as that was just a better life.