According to Genesis 1, God created something on each day and called it good. On the sixth day he created men and women and he didn't call it good, he called it very good. The popular Christian interpretation is that people are very different and very special in the context of creation. Maybe because people have free will, they have sentience, they have souls or immortality, but whatever it is, is an important distinguisher that makes us very good rather than just ordinary good.
I don't really have a problem with that. But let me propose something further.
When God creates people he also gives them a mission. He tells them to be fruitful and multiply, to have dominion over it, and subdue it. This is the beginning of the process of transformation, perhaps from the garden of Eden to a Kingdom of God. Christians call this the Creationist Mandate. The mandate is in this context that he calls this creation very good, implying that what he told men and women to do will transform creation from good to very good.
After all, it says that God saw all of what he had made and called it very good. All is an important word here. He's not just talking about people. The things that he formerly called ordinary good he is now calling very good after he creates man and told him what to do. It does not say all on any of the other days.
He created man, told them what to do, and he's like, "now, because of what man is going to do, this whole thing is going to be really awesome."
Of course in the biblical narrative, that process was interrupted by sin. But does it make sense for an all powerful creator to have to resort to plan B? No, that kind of God would solve the problem and still accomplish what he sets out to accomplish.
