Narrative: The film constantly switches between the game world and reality but we are never quite sure what is real. It is full of twists, at the end we find out that the whole story relating to eXistenZ is part of the game transCendenZ. The characters are absorbed into a world they accept, they believe is real that they can do what they want, but in doing so they begin the question reality.
Interactivity: The film is constantly making us think, we are taken into the concept from the very start of the film and we are the ones who are questioning what is real or not. The fact we are unsure what is real makes the us feel tense, we have no idea whether getting killed in the game world could easily be in reality. The film makes us question the world we live in, how do we know it's real? a very similar concept in 'The Matrix'.
Convergence: The convergence of reality and fantasy can be overwhelming and confusing. We have to think more about the film than being about the relax watching it.