I see a large problem...
Well, first off, you shouldn't be stealing actionscript and just putting graphics over it to call it your own. You really should edit the script enough to make it different from every other space invaders game... other than that, the graphics fit with the scene, but there were no stars in the background. Oh, you should be able to shoot more than one laser at a time. It makes the game too slow. Uhh, yeah, this needs alot of improvement. Good start though.