What DAW do you use?
This... this is good. heavily synthed. Maybe you could less... punchy synths in the melody up until 1:18. Also, I personally feel like the power kit that opens at 1:18/1:20 shouldn't be there. maybe a bit less powerful kit. 808/909, maybe?
This is a guess, but I think you're using MixCraft, right?
1:42 - guitar needs some work. Don't be afraid to screw around with the MIDI controls a bit. (I am assuming you are using Mixcraft: when you are editing a VI sample, the little white bar below the piano roll is your MIDI control. this is usually defaulted to Velocity On.) Also, assuming you use MX5, try to plug the guitar through Shred Amp on the softest settings it will go.
This is me being very thorough. This is very unusual for me, btw
3:30 - piano is very strong. Don't change that.
4:17 - when the lower synths begin to fade away, try to fade out your melody synth or control a filter to cover it up in real-time.
5:04 - like the animation on the cello. However, you could add a bit of sound variation on it.
Very good overall. Will need work, but this is a very solid piece.
Needless to say, I couldn't come close if I wanted to
EDIT:
What? there's never an invalid choice for OCR!!! Just the mix itself. (except for any "source" that happens to be 90% unusable sounds and melodically-lacking rhythms, of course...)
(re)EDIT:
Thought so.
Nothing wrong with Mixcraft. It's notoriously simple, and yet it can be pretty intricate when you work at it.