Wow, I seem to have developed a thing for house music...
I love the simple theme and where you took it from a simple three note progression. Also I respected how you carried it from start to finish instead of losing it halfway and making a bad attempt at a turn or a random bass drop.
At times though, I feel you could have fleshed things out much more by putting more drums (not necessarily beats) and more sounds, such as adding a high accompaniment to the main theme at 1:00.
And as a personal thing, a well placed and supported pan can work wonders.