This is too good to be just background music haha, I think you did an excellent job and could turn this into a full blown song if you wanted to. The climax that goes into the main beat of the song could start right where you ended it.
Also, I really like the tempo of the piano giving it a rather moody/hero-about-to-rise feeling. You know like when the world is in destruction and someone just said "Enough!" as the hero is about to take out whatever caused all this destruction.
Overall great job, it's just a tad short. (I know you meant for it to be background music but it cuts off too fast)