Nice Work
Very nice song. It's bright and cheery, and yet at the same time very lax. The piano fits very well into the ambiance. In my opinion, I feel the song would flow better if not for the transition at 1:38, from slightly harder sounds to the softer tones which remain for the rest of the song. This is no great matter though, and mostly preference on my part, I just feel it would give a little more unity to an already solid song.
That said, and in response to vaifan90 (below)'s comment; I didn't believe his statement at first, yet after comparing this and "Relaxing Time" (also in the audio Portal), there is a full 25 second stretch, beginning at 2:24 on this song and 1:04 on the other, which are Exactly the same when heard side to side, save the subtle ambiance in the background of yours. Melody, pitch, even timbre are the same otherwise. I hate to say it, but that would be one incredible coincidence. If you did use the little stretch of music from him, just go on and say it; there's a lot of great music on the audio portal, and more than enough remixes, and no one is going to care if you take a portion of another song and admit it.
Cheers!