Easily usable in any situation, I don't think its only credits. Its got a very tense and energetic feel to it, it can be used in fighting scenes, grand epic wars, OR like you said, in credits ^^.
Now enough with the "ZOMG I LUV IT" rant, on ONTO the review!
The beat was solid, it definatly kept the piece together.
That heavily resonating guitar was well used.
The pads you introduce are well placed, though the last one you introduce got a bit too loud, overpowering the rest of the instruments.
You used the same melody, however by adding new instruments and pads over it, you've made it far less repetitive, good planning on your part, I do likewise for a lot of my pieces.
Any and all other suggestions I have would drastically alter the song itself, and therefore do not apply to this song.
5/5, keep them coming or die >:D.