What did I do wrong in my python-kivy code?

I am having problems with the missiles in this invader game from Kivy-Interactive Apps and Games book being extremely large taking up half the screen. I don't know what part I messed up on, but I know I did. If anyone could help, I would be very thankful. Here is the link to my code if anyone is interested:... show more I am having problems with the missiles in this invader game from Kivy-Interactive Apps and Games book being extremely large taking up half the screen. I don't know what part I messed up on, but I know I did. If anyone could help, I would be very thankful.


Here is the link to my code if anyone is interested:
https://drive.google.com/drive/folders/0B83Z0GQm9TkOZzVNejRLTVhCcUU?usp=sharing
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