Going Further
Uno a Uno
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use A and B for second player controls instead of AI.
Add a two-player mode. Instead of controlling it with the bad AI, make the A and B buttons provide the second player for HOURS of fun time.
Spring loaded
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Add a spring loaded feature the paddles, so that the player can add an extra oomph to the ball if they time their strike just right.
Power-ups?
Create a randomly appearing item that, when collided with the ball, boosts the speed of the game, or slows the opponent, or something else awesome.