This film has many wonderful mystical themes on the nature of the soul, the afterlife, premortality, and the meaning of life.
What is the nature of existence beyond our mortal life? Do we have anything to do with it? Yes, very much so.
The answer may be found in the question, in the identification of the "I." Who we think we are and who we really are affects how we consider life after death, and what we will thus "feel" there.
When the finite body dies, is that the end of our person, or do we continue on? Yes and no.