So lets start from the top:

WRONG BASS DRUM. Make it harder, louder but not overpowered. That way you can emphasise the guitar. Because of that I feel that the song really was wack.

Your guitar is OK at times and not to well at others. For example, the intro was excellent (really had a smile on me). But then the weak drums come in and there was not backing to the main melody so it was very bland. Then you have your headbang section at 52 seconds but it was really lacking.

Check out a song called agalloch - limbs. You may find it good inspiration. This is because your section at 1:08 had a similar sound.

There is much I would change but otherwise you are really not that far off!
For now, work on your drums and think about how to complement your main guitar properly with harmonies.

Constant arpegio on the harp ruined the intro. Try using more of a strum from low to high quickly and only on the beat every so often to make a more dramatic sound.

Choir, well done.
Sleigh bells. Again, nice!
Flute, I would have used a different instrument. Piccolo I think would have done better.
The church bells where very nice

As the song progressed you really outdid yourself which is why I feel that you need to change the harps.

All in all, it was a lovely song