Thanks for your comment. The idea here was that during the first part of the music there is some kind of introduction scenes, like showing game characters, fly-over takes of locations, etc. And then, during the second faster part of the music, there is some action like a fight or a chase. That's why there are two distinct parts in it - first slow and dreamy, then fast and intense.
But yeah, I agree with you that it hurt the overall experience when you listen to it without any video - it may seem like the song is too slow to really start :)