And here comes the constructive criticism. :)
The drums here are really "busy." They are constantly playing, which gives the song a somewhat cluttered feel. If you have them playing less often, and perhaps make them stronger, they will be more effective.
The synth that kicked in around 0:07 got a little old, but maybe that's just me. I liked the section that started at 3:22, but you really need to change the string synth to something less synthy.
Also, the song would probably benefit from pads. And you might disagree with me on this, but I can envision the melodies developed here working really well at a slower tempo.
As you can tell, I like to nitpick. Overall though, especially in the melody department, you did a pretty good job.