EQ!
Look at this: http://www.blackspherestudios.com/sub mission.php5?ID=359
That'll help you out on fixing the massive clipping issues on the drums. The piano sample sounds pretty bad too, so I'd suggest either 1. getting a new sample or 2. EQing and putting reverb on the existing one. The strings in this song actually sound very good. It's weird hearing a cringe-worthy piano sample playing along with those wonderful strings in the background.
Outside of the technical details, I love the actual motif playing in this song. It really feels like an ending theme. Unfortunately, the variations you put in (such as 3:20) feel random and out of place. The one at 3:20 actually sounds off key. The melody in general in many places could use a little work, since it sounds kind of like a really good idea that you didn't quite know how to expand on. I'm sorely tempted to do a re-interpretation of this myself.
5:25 was a very nice key change, but the ending would be vastly improved not by a better sample, but simply by echoes and reverb (and of course, some EQ, but the whole song needs that). Either way, very good idea, fair execution, needs some work, so a 7/10
7/10
5/5