Wonderful little loop! Krichotomy actually outlined all of little criticisms I had for the piece, such as the blip at the end of the loop and the need for the tambourine to a little more subtle, but I'm not so sure about the overcompression. Not very good at spotting that stuff out myself unless it's blatantly obvious the artist went overboard with it.
I guess it's all about keeping a nice level of dynamic range in the mix. The bit with the layered vocals has a bunch of instruments playing short notes, which is giving off a slightly chaotic feeling. Usually when I think of overcompression though, I think of the volume constantly hovering between -1 to 0 dbs and everything being brickwalled into the center.
Ah well, never said I was an expert in this stuff! All I know is is that it sounds awesome, but just needs a few minor tweaks. Sorry I can't be more in depth on dynamic range. I only know the very basics, and I understand it's a very intricate subject.