Quite catchy i say...
This is a very good song but the volume levels need to be worked on. The drums aren't loud enough and the "elec guitar" sample that plays for the first half of the song could be a little louder. I also think that you could use some better samples. Google is your friend :)
The constant change of intruments was a good thing as it kept the song entertaining and diverse.
Nice work, good luck with the contest.