Functions, and could be made into something fun. However, you can just hold down 3 forever and not get hit.
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Use Pingas Fire Balls to avoid Tennis Balls. Press "1" "2" and "3" to fire the PINGAS shooters.
Well, it is a little interesting, I guess. Oddly, when I fire, it fires 2 fireballs instead of 1. There is nothing too special about this game. It is only interesting to me because of the odd choice to have a witch in the top left corner.