Most of the time i won, because the others left the area :)
Nice concept, good music.
The controls: ehm... improvable. maybe some kind of speed-rampup would help. then smaller sized curves would be possible. something like that.
The graphics: definitely needs some "eye-candy" (particles, glow, etc.)
(13kb? really? including the titlescreen and the music and phaser? ;-) ... )