Nice! Short, simple, but well-polished, which is very important.
It would be cool if there was something to drive home the idea that you're playing as a firefly. Maybe make the movement feel more floaty or continuous, like you're actually flying through the air. Or make bumping into walls damage you, since there's no real losing conditions except accidentally lighting two candles in a row, which is easily avoidable.
But overall, well done for something made in just seven hours!