I like the song, but it doesn't make me think of the "sad" theme you were going for. The beginning, sure, with the slow piano work and low-tempo techno additived, yes, that was kind of melancholy (or romantic, oddly). Once the tempo gets jacked up, though (at around 0:45) the feel of the song changes completely. To me, from then on, it felt like a fast-paced, inspiriational piece. Like something that might play as a warrior is running to battle, a ninja hopping from tree to tree to get somewhere important to see someone, or a hoverbike skittering upstream while dodging boulders.