I spent a couple of minutes thinking about possible variables that would change the make-up of planets and their inhabitants (or lack of):
planet size, star size, planet mass, star mass, distance from star, % rocky, % water, % [type] gas, % [liquid] liquid, heat range, atmosphere depth, hollow planet, % [mineral], mineral, toxicity, radiation.
Obviously some of these would impact each other, a planet close to a large star would be very hot and would include molten rocks and metals (liquids), water would be a gas (or non-existent) and the chances of life would be zero – or at least how we understand life. A very cold planet would have gases as we know them in liquid form (like hydrogen). A mostly hollow planet could have animals with very large eyes because they need to see in darkened places. A planet with a low atmophere could be more advanced due to being able to space travel easier. Distant galaxies (i.e., those further than the big bang – travelled further / created sooner) would be much more advanced, as they’d be that much older.
I’m fairly sure that the Hello Games have already considered all of this and much, much more.
If it were me, I wouldn't tie the game to our universal laws and try to make everything scientifically plausible...
I seemed to remember hearing in one of their interviews that they wanted the game to be fun first and foremost, so it’s very probable they’re doing exactly this. I can’t help but think that the more variables that are added, the more diversity the game could have. Some sections of the universe could have made up physics, others with physics as we know them. The reality is we know very little about physics in the universe, so a simulation with a wide expectation could actually help us to learn about extreme variation.
I've probably too high expectations.