What is the author's tone in the novel, Moonglow?

One of the most striking things about Moonglow is that the tone in which it is written is so playful, inventive, and energetic, and yet it deals with many extremely somber topics, such as war, trauma, family struggles, aging, and morality. On one hand, this disparity seems to function by making the dark subject matter more palatable and engaging for the reader. On the other hand, as more and more of the dark themes and subjects are revealed, the more prominent they become against the background of the narrator’s entertaining tone and structure. In addition, the text’s generally upbeat and adventurous tone often seems to reframe the story’s darker elements with a sense of optimism, as well as heighten the poetry of the moments that are inherently optimistic to begin with.