Maybe it’s not. Maybe we are all tiny parts of same consciousness that creates the dream, which makes it consistent based on our shared expectations, or shared subconscious, or whatever connection it is that makes us one. Or something along these lines.
That would explain the consistency without relying upon rigid materialist laws.
I second that opinion. It seemed shallow and easy at the beginning, but turned out to be a really entertaining and challenging game. I also love how the characters age, develop, and eventually retire.