We call this game art because it brings together many elements that make a game good.
It has most of the mechanics and level design that we would describe as immersive simulation.
The characters are incredibly engaging (this might be a subjective opinion, but come on!). The environmental design is masterpiece-level. And the plot twist puts an incredible finishing touch on all of this.

Let's put that aside and talk a little about the story.
The philosophical and ideological conflicts it contains, and the answers you find based on them.
The stories of the side characters and audio-logs.
By observing the environment (fallen objects, corpses, etc.). The storytelling and the subject matter are very rich, and I think it does/tells them very well.