you press the green flag. You must try to kill all the alines/clones before they get to the bottom of the page or it is game over. You must also make sure you do not get hit by a bomb that the aliens shoot or it is also game over. You can shoot a Blue Lazer by pressing space. You move left to right using the left and right arrows. Have fun and good luck! :) P.S if you kill all the clones before they reach the floor you have won but I could not figure out how to show that on the screen. SORRY!!!
I did all the coding. This was the last chapter in the book I am using so from now on all my projects will be 100% me. P.S If there are multiple games like mine I apologise but I felt it was a waste to just leave it there in my files not to be played ever again.