Amazing :)
Yes, the percussion does need to be louder. At the moment it's not quite in your face enough.
Melodically and structurally this song was amazing :) I didn't like the sound of some instruments, such as the vioin? at 0:14. It was too loud, and I don't think I like the actual sound itself. Maybe look for a new violin sample/soundfont/synth/etc?
Anyways, all that aside, it's REALLY good. You've got some skills. One of the best composers on NG, clearly.