I Like It...
I could really see this in the ice world levels in Super Mario. Really man, it would fit those so well.
You created a nifty little atmosphere with the chimes, bells, marimba, and strings. They mesh so well together, and really the strings have the perfect timbre to them.
It sounds like you used a pan flute in a spot or two. But I could be wrong. If not, then maybe think about adding a little pan flute if you go back and work on this. Because I think a pan flute would sound wonderful in this piece.
I think the major shortcoming in this piece is how short it is. Because it is not even close to being an acceptable length for a song. As a loop though, this would be pretty decent.
Vertically I don't think there is much work to do. The overall mix of instruments is spot on and rich in color. I like everything you did here except for how short you made it.
4/5 and 8/10 overall. Nice work here bud.
-Gravey-