I like the heavy, dark piano at the beginning. It leaves a lot of space for climax and contrast. It progresses a little slowly, though. I'm hearing the classic DM-style leads. ;) Also, it sounded like it was really leading somewhere up until around 1:05, but then you stripped away the synths again, making it sound pretty anti-climactic. Generally, I think you could've cut a lot of content in this piece, especially during the first 2 minutes. When you bring on the bass at 2:10 it has an awesome, energetic vibe, although the bass is really up-front in the mix. I suppose I would've liked to see the melodic content take over a bit more at some point before 3:30 or so. I also think the kick might be a bit too loud. In my opinion, the kick (especially if it strikes on every beat) should serve to simply keep the beat going and the energy up, but here it's a little distracting at times. That said, I love all of the melodies, harmonies, and the progression. You might also want to aim for some more dynamic contrast sometime. Creating a re-intro that builds up in a similar way as the first 2 minutes of this piece would be a more effective way of structuring such a long track IMO. Anyway, overall nice work, DM! Keep at it, man. ;)