Identifying Tone in Childhood Reflection

In the following excerpt from a personal essay, the author reflects on their childhood experiences playing in the park:

"As the sun dipped below the horizon, painting the sky in hues of orange and pink, I would race to the swings, feeling the cool breeze whip through my hair. The laughter of my friends echoed in the air, and it felt as if time stood still, enveloping us in a bubble of joy. Those were the days when my biggest worry was who would push me higher."

Which tone best describes the author's writing style in this excerpt?