Nifty
It's pretty amazing what people can do with instruments. Not everyone can produce an entertaining piece with replayability and longevity. But this song proves me wrong, with it's combination of guitar, strings, synths, and percussion.
I love how one sound builds up to this huge, grand piece which envelops you in this tense environment of urgency. From 0:47 to 0:49, you can sense a transition from preparation to action (although the transition is a little rough). At 1:53, you can feel a brief sense of peace, like being in the eye of a hurricane. Then after a minute, it's back to the sense of action.
Personally, I love that part from 1:53-2:52. But I also loved the subtle things, like Animith said. The additions of new instruments that blend in, before a string takes over, is welcome. This sounds pretty professional in my opinion, though I'm not a huge fan of the structure (it occassionally transitions to a part that doesn't live up to what the main rhythm and beat created: the setting).
Still, I could see this at the conclusion of a flash movie, where the protagonist savors the moment, but is aware that danger might come again (setting up a sequel). I could imagine hearing this in a montage scene where everyone is preparing for a huge battle, etc. It's that epic, and I hope you make more music like this!