In drama, there is often a tendency to dwell on the darkness and pain. It can be easier to capture an audience with sadness than with joy. We should make a conscious effort to focus some gameplay experiences on events of joy and comfort; not just the resolution of a crisis, the avoidance of catastrophe, but also the discovery of new levels of happiness and fulfillment.
I was just thinking that most upbeat moments in game stories are, if not humor, little more than the end of unhappiness. Joy should take us far beyond mere relief.