First of all... This is a midi rip-off.
Second: Mixing is bad especially the Dubstep part.
The piano needs to be limited in the bass.
The kicks distort the piano making it sound very low quality (especially in the build-up)
After the drop im confused because i hear the main melody again.
And than the dubstep part... I'm must say that im not a fan of dubstep but this just makes my ears bleed. You should not have merged the main melody with the dubstep part the dubstep part dominates the melody making it very hard to actrually listen to the other. and after that it doesnt change. And remixes should contain unoriginal and original parts not only unoriginal parts. But what the heck do I know about producing. I just draw terrible porn...
bye