Keep the mouse cursor inside the playfield and click on it. Use the Numpad-Arrows to move your paddle. Space to shoot. Note that performance is much better if your keyboard repetition is set to fastest in the options. This SVG game needs the Adobe SVG Viewer plug-in.
If you like this game, you can also check Pearl6.
More SVG games, and tutorials, can be found at KevLinDev.com.
Also, check out more goodies on this site.