There's a bit of awkward silence at the end, probably happened during exporting of the audio.
While I don't think this fits Challenge C, I still think it's a good piece. I think from a notation standpoint this is a lovely piece, just as much as it is soundwise. Very Holiday-esq, bright but chilly at the same time.
The change of tone midway through reminded me of the music from Gex, specifically the Christmas Movie themed level, just this very in your face holiday cheer sort of sound.
Aside from all of that, I do think there's a lot of wide low end in your mix and during the segment around 2:20 it becomes very unequalized, very wide only to go back to being very narrow.