Well done!
I like this song and its composition. I don't know if I would use this for an epic boss fight myself, however it definitely sounds like an epic theme for an RPG.
I like its composition and I think its decently well written. The problem with it is the sound. It needs work on the mixing side, and also on the mastering side.
However I certainly liked this enough that I chose to download it and remaster it myself. So if you want it, just email me about it or PM me.
Keep up the good work!
~Phyrnna ^_^