Very good, I'd like to use this in an RPG maker game I'm working on. Can I use this and give you credit

This is really good! I love the brass section along with the choir! Truly amazing.
Could I use this and give credit?

Nice one! Should have been added more dramatic music or beats or whatever else that would've made this track more intense!

Well

Let's break this down. The way I see boss fights, you got the regular boss battle, the hard boss battle, the final boss battle, and the final form of the final boss battle.

This probably hits the "hard boss battle" tier. It sounds powerful but yet it is dire. Something I could imagine fighting a very difficult fight to, but this is not quite good enough for final boss music.

a bigger bang

Almost spot on imo, im just missing the pounding feeling when the drums strike.

but still worth 5/5 9/10 for epicness :)