This isn't a negative comment, just a comment in general. It's really hard to play this game on a laptop without a mouse. :(
It sounds interesting; however, it's kind of hard to figure out what to do before the level gets chaotic (i.e. for a player trying to use an touchpad, maybe it just isn't registering how it would with a mouse, so it might just be my set up).
The tutorial isn't much of a tutorial as opposed to a screen that tells you what the controls are. Maybe it would be better to use the phrase "How To Play"? It would help a lot if there was a screenshot of that "tutorial" screen on your game site, so that I could see the relationship between the words on that screen with the game play screen.
The lines are very interesting concept to make sure you know who is homing to who. I'm sure I would have had a more enjoyable time if I had a proper mouse.
What is the idea behind auto mode?
Nice work anyway. The tracking feels really smooth. Nice music. :)