This is the second boss battle theme from Cave Story, a game made by Daisuke Amaya, A.K.A Pixel (yes, only one guy made this entire game, including the music; just like another Japanese guy which doesn't stop drinking for shit). This should be best suited as a boss battle which needs some degree of intensity.
Quality-wise, it's decent. I must admit that I'm not really into this arrangement, your samples choice is a bit questionable here (it's like you're mixing MMX with Secret of Mana pretty much). In other terms, the choir and the strings samples bug me when listening the ensemble.
Txt-wise, it's acceptable. I don't see many other ways looping could be better than this.
Side note to whoever will use this: lower the master volume (wXXX value) since, even if it's 140, it's still kind of loud in-game.