there is something wrong
when i pressed play the game started and.. no ship!! but there were a lot of aliens. but i didn't have a ship! so they just scrolled all the way down untill they all disapeared! o points for interactivity because i didn't have a ship to shoot them with. 10 for humor because i found it all very amusing. hmmm yesss. where did the ship go? is it a bug? fix it.
hope that helped.