I like the relaxed, almost slow-mo like feel the song gives. It's something I couldn't get too sick of.
Albeit, despite it being a loop, I'd figure you could've done more with the song.
You should try re-releasing the FULL song. (Like... The original Super Mario Bros. 1-1)
Even though not much was wrong, the overall quality really can only go so far as a 7 out of 10.
Keep up the good work.