My best score is 20 ships (I should point out that I'm color-blind and it's really hard to tell the difference between the two portals on the left, pink and green I think. But I compensated by using my graphics tablet to make the ships make nice curves on the way to their portals :D )
Anyway, the game is great, the concept works very well, the path mechanics are very clean, and the music and sounds are indeed a little plus (which didn't break my ears at all :D). Well done!