How do I play nano lasers?

As far as I can tell, you have to change the arrows so the laser goes in to the goal, but even if I set up the arrows right, nothing happens when I fire. Am I aiming at the wrong symbol?

Spoiler: (click to show/hide)

Have you turned on the squares?

That isn't changing anything. There must be someting incredibly obvious that I'm missing here.

Does a white thing fly out when you shoot?

Does a white thing fly out when you shoot?

That...nevermind...

The white thing is the force field thingy that makes you lose points. 

When I shoot at the red square, it just blinks and stays in the same spot. Is that what's supposed to happen?

This topic should have [spoilert] in the title since figuring out how to play it is part of the game itself.

The posts containing the answers already contain spoilers, so its okay.

Spoiler: (click to show/hide)

Have you turned on the squares?

that's the only thing i ever needed to do? 
i ask for a refund.

figuring out how to play it is part of the game itself.

Oh, I figured it was supposed to be obvious. I don't like puzzle games much. Oh well, thanks for helping me out.

The white thing is the force field thingy that makes you lose points. 

Loose points? There's a scoring system?

Seems as though all of you have at least one thing wrong.

First: no, there's no scoring system.
Second: yes, the whole idea of Nano Lasers is to figure out what you need to do; actually doing it is really easy.
Third: the goal is to hit the target with the laser.  To do this, you need to configure the arrows so that the laser will hit it, and make the laser travel for long enough that the object blocking the target can disappear.  The laser dissipates over time, so you need to have it pass both of the squares at the right time, and the squares need to be activated for this.
Fourth: nothing really happens when you "win."

Seems as though all of you have at least one thing wrong.

Do not

1. I was saying that.
2. I knew that.
3. Duh.
4. If you've won, you know that.