Evolution:
The star, plants, animals, and rocks will change as time moves past, the game simulates evolution as if hundreds of generations happen with each new offspring. Animals may sprout 7 legs and 5 mouths, maybe trees will prefer to be upside down. The star, if massive enough may go supernova after expanding as it burns helium, becoming a neutron star or black hole. Perhaps it will just become a white dwarf and fade slowly for trillions of years. Maybe you will not get a star at all, just a failed star called a brown dwarf that glows for a little while before fizzing out. The Rocks will erode away and leave pebbles and stones for you to pick up and use in your crafting.*The Above image is not to scale