For 1v1 use WS and up and down arrow. (Player 1 is on the left and Player 2 is on the right). For bot use your mouse for up and down and you are on the left. To reset click the green flag. The bot is supposed to be hard and if the ball gets stuck behind your paddle, just move your paddle. Also, the ball is supposed to be lighter and then darker.
@Zinnea for a bit of the code for the ball.