SFX: Sounds like Transformers movies sound effects. The death and the roar sound really similar and the roar is a little long. But altogether very good and consistent. I am getting a zerg from StarCraft vibe from the voice.
Music: I think you have two parts with the same trumpet instrument, and it seems impossible to play, or like they are interrupting each other.
I can't hear the bells very well, and would like to hear more of them.
I like your driving strings
At 35 - 40 seconds the trumpets becomes super duper jarringly cheerful, and again at 1:10 with the cello