Determining the Author's Tone in Leo's Story

The following passage is an excerpt from a story about a young inventor named Leo:

Leo spent most of his days in his cluttered workshop, where the faint smell of oil lingered in the air. His eyes sparkled with excitement as he pieced together parts for his newest invention, a gadget that promised to solve everyday problems. As he tinkered, he muttered to himself, "This will change everything! People will no longer struggle with these simple tasks!" His voice filled the space, echoing his determination. Leo’s friends often visited, but they would shake their heads, saying, "Leo, you have so many ideas, but will they really work?" Undeterred, he replied, "Just wait and see!"

His heart swelled with optimism, believing that innovation was within his reach, even if others doubted him. As the sun set, casting a warm glow through the window, Leo finished his project, and a smile crept across his face, filled with hope for the world outside.