Too short.
Understandable though since it's for the collab. But it sounds like a great intro! Something that I can see as an intro to a game or flash also. The heavy chord at the beginning is a very nice contrast to the light running of notes that follow it.
Great job! I'd like it if you could make this a full song. :3
-HFX ^_^
P.S. Could you please listen to my collab submission? http://www.newgrounds.com /audio/listen/201029
Leave a review please! ^_^