We could say that the "purpose" of life is whatever the mind believes it to be. The mind creates meaning and the fact that "purpose" is different for each individual suggests that an objective purpose does not exist. At least not one that can be comprehended by the human mind.
Personally, I do not think that we should separate humans from other forms of life. All life is conscious and has consciousness. Just because a human cannot comprehend the consciousness of an animal does not mean that a human life is more important than an animals. Such a notion exists because of human ego.
God may be an energy that flows through all of life and all matter. God may be consciousness itself. If that is the case then maybe the purpose of life is to simultaneously create and experience creation. In other words, god experiences itself.
???