Hm!
I noticed you have a recurring accidental note during the first part of the 4/4 string lead. You hear it right at the 2.5 second mark, and it repeats all throughout. It's pretty distracting.
If you fixed that accidental note and push this piece to a full 3 or 4 minutes, you'd probably have a great piece on your hands. I think what you have is excellent (minus the nagging note) - a nice blend of electronic leads w/ symphonic chord progressions.