I've been hard at work at overhauling most of the synths, added some parts, and changing some effects. Let me know what you guys think of the changes.
Entirely new synths for the lead and those harpsichord/xylophone instruments. Replaced the orchestral hit, too. As per @pokemoneinstein's suggestion, going for a chiptune feel made it much better IMO.
The bassline has a low-pass cutoff that is faded out for the intro.
Added "slide up/down" sounds during a build.
Gave the main synth some notes when the percussion first cuts out. Same notes show up in the outro, too.
Added a piano part at the end. Tried to humanize the note timing/velocity
Enhanced the stereo of some instruments
Random EQ, volume changes, filter levels, etc.
http://tindeck.com/listen/fzmk (Revision 2)