Hi guys! Appreciate the concept of the game as we are living in it right now lol
Some things to consider:
1. Add more interactions to make it an experience
2. I got out of the train, and looking around, the station feels like a stage set. Adding floor, ceiling, walls, would be nice.
3. Building in a way that player can't see the Unity's default 3d setting.
4. I can enter the open space and fall down, out of the scene.
Good work! :)