Left Mouse: Fire
Mouse: Aim
(Your weapon is also a shield!)

Destroy the Incoming Invaders As they attack your base to the sound of the Bass.
Can you finish the entire song?

* Your weapon also acts as a shield.
** Requires Latest flash - Flash 9**
http://www.adobe.com/shockwave/download/download.cgi?P1_Prod_Version=ShockwaveFlash