I feel that something along this line would make for a great theme song:
I've seen several comments about no words, but I completely disagree. Going to some of my favorite game series with great theme songs, The Elder Scrolls themes. Of the three youngest, Morrowind, Oblivion, and Skyrim, Skyrim is the only one with lyrics, although Oblivion has melodic vocals, and it is the only one the gives me goosebumps. To be quite honest, lyrics and vocals add so much more to a song. I think what's needed is a minimalist song that carries itself well in the low parts yet can really ramp up and obviously have meaningful lyrics.