I understand your idea and I have something to add to it.
Based on the fact that you are trying to show the limitations of life, the following ideas could also be implemented:
1. A person has only one life. After the timer expires, the game somehow deletes itself or makes it impossible to replay (breaks the game files).
2. It is impossible for a person to experience everything in one lifetime. It is necessary to add so many exhibits and content that the player cannot physically watch it all before the timer expires.
3. It would not hurt to add interactive elements to your art, which would reflect the idea that a person is able not only to contemplate, but also to influence the world around them.
4. It may be superfluous, but it would be interesting to see any random events, because our lives are just as random and unpredictable.
I don't know how well these ideas fit your philosophy, that Art, aesthetics and beauty is one of the noble things that we should engage with with our limited lifespan, but adding things above will make the gaming experience more valuable, because each person explores their part of the map, they will come across their own random events and eventually they will He will live his own unique life.