Stunning atmosphere. You've got a lot of very interesting stuff going on here, and my only possible critic is that this is shorter than what it could be if you used a bit more out of that kick and maybe some high whistle.
Very good job, could I have the source of this?
This is magnificent. The instruments are well chosen, the melodies change, and aren't predictable, great!
The only thing, and this is a slight thing, would be to make the drums a bit more varied.
But this is really a good song.
The blend of instruments is great, the whole thing flows well. I can't really hear the 3 melodies, but I do hear a great "sound-scape". You might want to try making them a bit more pronounced, and maybe add a break in the song (try using supersaws for the really top melodies, they always get heard over everything).
If you want a boss battle, you normally have to stress people a bit more, and make them feel scared. Here are two examples of what I mean:
http://www.youtube.com/watch?v=IdAzVh Cof_4
http://www.youtube.com/watch?v=0uAsD6 lQV1I
You couldn't sit still and do something relaxing with these going in the background. Your song is missing that hyper-agressive beat that would make it a boss fight, imo.
Still, good work. Although I wouldn't see a boss fight here, it still is a good reflective mood music. Keep it up!
Age 28, Male
Switzerland
Joined on 9/22/11
The Forgotten Castle 
Rainbow After the Rain 
A Story Begins