First time I actually hear one of your works
I will be commenting the midi file that you uploaded, would not surprise me if there have been some changes, after all it was written for almost 3 years ago.
I like your themes, they are truly memorable, but there are a few drawbacks. I may be very wrong,

. In bar 12 there is a pause in both the Trumpet II and Horn I, that comes a bit as an unpleasant shock since the density becomes thin very fast; it practically decreases from 3 instruments to 1. It may be the effect you wanted to achieve, since you do the similar thing two bars later. Nevertheless I find the first pause a bit like abruptly interrupting the flow.
In bar 27 the timbrel switch is fantastic, really marvelous. I mentioned earlier that I like your themes, I particularly like the one that starts on bar 27.
In bar 45 when the tension builds up to enter the main theme once again, I find it a bit too slim. Personally I would like a lot of tension, maybe spiced up with some dissonances, it would really make the climax [inserts a plentiful of smilies and metaphors

].
Another thing I noticed was the notation for the Horns, shouldn't the key signature be modified? Maybe it is an error on my account.