I hesitate to say that the drums are the problem, in that they really give the piece something special, however the reverb and attenuation of the hits could definitely be adjusted to make the piece shine more than it already is.
Around the middle of the piece my ears are left a bit tired, as it feels like the higher tones are a bit too harsh. I suspect a bit more variation in texture throughout the piece or a bit of tweaking to the higher toned lead would do wonders!