This sounds pretty much like a full song. In fact, it doesn't loop very well, so calling it a loop might be a bit of a misnomer.
Unless by loop, you mean just made a melody and built the rest of the song around it, which I'm under the impression is how full-on trance and dance and house songs are made these days, but I digress.
The melody repeats itself, and is basically the same throughout the entire song, but, there's enough variation to keep you interested. I like how you handled transitions, especially the one in the middle somewhere around 2:30 minutes.
However, I do feel you should add something of a break from the beat longer than just a few bars; you drop the beat for a bar or two, but I don't quite feel that's enough. A counter melody or something to keep things fresh would be nice as well.
I presume these things will be added in the actual song though, so I'm just mentioning them for the sake of opinion.
I do think you may have overused filter sweeps a bit, but they work.
-ish.
Lastly, I'd say the song drags on for far too long, especially since the melody stays the same. It starts to get dull nearing the end.
I'd say it does sound professional though.