Convey a sense of finality, but remain light and not overly intense or harsh. Include a soft descending tone or a gentle "whoosh" that fades out slowly, creating a sense of conclusion. Possibly incorporate a subtle "thud" or "chime" to indicate the end, with a peaceful, non-frustrating tone. Maintain a playful and non-stressful vibe, appropriate for an arcade game, even when signaling game over.