That's a really cool mix! Very in-depth, very cinematic, and I love the various styles. Just some feedback I had from watching/listening for you to consider (I'm no expert I'm just going by ear):
-At the very beginning (about 0:08 ), the sample from the original game skips a bit. this is likely just from improper sample placement in the sequencer; it's an easy fix, but otherwise I really like the intro.
-Up until about the 1:00 mark, I was loving every second of it. That odd reverbed clap at around 0:58 (like you noted) does sound a bit strange and jarring. Maybe it's the filter on the sample, I'm not sure. A higher-quality/different version (or just a different sample) should be considered.
-I REALLY love 1:10 to 1:55; I absolutely adore that orchestral/tribal percussion sound. At about 2:26, the guitar and fx comes in. While I do like the smooth transition, the guitar does sound a bit synthetic. I don't know if it is just a midi guitar or a sample library, but if it is, then I would suggest getting a guitar player to record it. If you don't know one, you can always ask here; someone would love to do a recording for a mix (usually ).
-Around 3:16, the same issue arises with the clap again; it sounds a bit jarring, another sample should be considered.
-At about 4:00 you had a cutting sound to match up with the video (will address the video in a sec). Quite frankly I though it was really disgusting; I feel that a more metallic effect (like
) would fit better and not pull the listener out of the mood quite so much as the fully visceral one does. Once again, completely up to you though; I don't think it would be rejected on that merit alone. Also same with 6:34, but to a lesser extent.-The kicks/bass at 5:26 sounds really distorted. I would suggest a cleaner sample to fit the feel of the current movement.
-Guitar at 5:55 sounds much better than earlier, but I feel it could be more dynamic in terms of volume. At 6:03, there's an odd visceral/flame-y sound effect that has the same problem as the sword slice; too gross (for lack of a better word). And as for the sword sound at 6:34, I feel that it lacked the impact that it required, as it is basically the climax of the entire song.
Okay, now let me address the video. The video is really really cool; you fit the song to the video quite well, and watching it is a blast. However, I listened to the audio-only mp3, and a minor flaw was apparent: some of the effects like the marching or the crowd screaming sound kind of out-of-place. I feel that the video was a major concern, and the effects do add to a more cinematic feel to the overall production, but as a song it sounds kind of weird. And don 't get me wrong, 95% of your song is really solid, and I love it, but I feel that adding and changing some things would be paramount to getting it posted on OCR.
I really do want to stress that this is an awesome mix, and as a massive fan of Fire Emblem, I love it quite a bit.