That opening and build... it's a solid base to build on. Then the synth at 0:40 comes in, which didn't mesh with what you established. It's more of an illusion of space more than anything - that synth did not sound like it was recorded for the same song, with all that hollow sounding reverb layered on top of it. Definitely agree that the transition at 1:36 came from out of nowhere, too - I didn't hear anything that lead me to believe that was where the song was going at all.
I could continue to talk about the strange synth combinations and such, but I think the others above covered that well enough, so I'll focus instead on a few parts that really stood out in a great way. The first forty seconds of the track really set up the atmosphere effectively - that haunting harpsichord and walking timpani set up the listener for something powerful. 3:28 - 4:30 has so much mass behind it without actually sounding cluttered (the hats were still distracting, though, as Liontamer said), and the increase in tempo was an effective way to build tension. The ending was also a great way to release all of that energy, with they dying arpeggio and subtle bass.
The source is quirky, and this approach ranges from regal to quirky itself (which doesn't necessarily work in your favor, as the piece does sound a bit unfocused), but I'm with the others when they say the beats are pretty bare and that the synth work is vanilla. When it's clicking on all cylinders it really has me going, but there's too much that I feel I need to wade through in order to get there. Hopefully you'll find some of what we said on here useful, though.
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