Can I get some help with Challenge: Pong?

I did the code exactly right, but  the game froze, without a oh noes problem, here is the code

var player1Y = height/2;
var player2Y = height/2;
var player1Score = 0;
var player2Score = 0;
var ball;
var gameStarted = false;
var t = 0;

//Constants
var PAUSE_TIME = 60;
var PLAYER_MOVE_SPEED = 2;
var BALL_SPEED = 2.5;
var PADDLE_HEIGHT = 100;
var PADDLE_WIDTH = 20;

angleMode = "degrees";

var Ball = function(position, speed) {
this.position = position;
this.speed = speed || BALL_SPEED;

this.radius = 12;

this.resetVelocity = function() {
this.theta = random(0, 360);
this.velocity = new PVector(
this.speed*cos(this.theta), -this.speed*sin(this.theta));
player2Y = height/2;
};
this.resetVelocity();

this.draw = function() {
fill(255, 255, 255);
noStroke();
ellipse(this.position.x, this.position.y,
this.radius*2, this.radius*2);
};

this.collideWithPaddle = function(x, y) {
if (this.position.x - this.radius < x + PADDLE_WIDTH/2 &&
this.position.x + this.radius > x - PADDLE_WIDTH/2) {
if (dist(0, this.position.y, 0, y) <
PADDLE_HEIGHT/2 + this.radius) {
if (this.position.x > x) {
this.position.x = x +
this.radius + PADDLE_WIDTH/2;
}
else if (this.position.x < x) {
this.position.x = x -
this.radius - PADDLE_WIDTH/2;
}
this.velocity.mult(new PVector(-1, 1));
}
}
};

this.update = function() {
//Handle wall collisions
if (this.position.x < 0) {
player2Score++;
this.position = new PVector(width/2, height/2);
gameStarted = false;
this.resetVelocity();
}
else if (this.position.x > width) {
player1Score++;
this.position = new PVector(width/2, height/2);
gameStarted = false;
this.resetVelocity();
}
if (this.position.y < 0) {
this.position.y = 0;
this.velocity.mult(new PVector(1, -1));
}
else if (this.position.y > height) {
this.position.y = height;
this.velocity.mult(new PVector(1, -1));
}

//Handle paddle collisions
this.collideWithPaddle(20, player1Y);
this.collideWithPaddle(width-20, player2Y);

this.position.add(this.velocity);
};
};

ball = new Ball(new PVector(width/2, height/2));

var drawScores = function() {
var s;

fill(255, 255, 255);
textSize(20);

s = "Player 1: " + player1Score;
text(s, width*0.25-textWidth(s)/2, 25);
s = "Player 2: " + player2Score;
text(s, width*0.75-textWidth(s)/2, 25);
};

var updatePlayer2 = function() {
if (abs(player2Y-ball.position.y) < PLAYER_MOVE_SPEED){
player2Y = ball.position.y;
}
else if (player2Y-ball.position.y >= PLAYER_MOVE_SPEED) {
player2Y -= PLAYER_MOVE_SPEED;
}
else if (player2Y-ball.position.y <= PLAYER_MOVE_SPEED) {
player2Y += PLAYER_MOVE_SPEED;
}

};

//Move the player up
var movePlayerUp = function() {
player1Y -= PLAYER_MOVE_SPEED;
};

//Move the player down
var movePlayerDown = function() {
player1Y += PLAYER_MOVE_SPEED;
};

var drawPlayers = function() {
//Constrain the player movement


rectMode(CENTER);
fill(255, 255, 255);
rect(20, player1Y, PADDLE_WIDTH, PADDLE_HEIGHT);
rect(width-20, player2Y, PADDLE_WIDTH, PADDLE_HEIGHT);
};

draw = function() {
//Control Player 1

//Draw the environment
background(0, 0, 0);
updatePlayer2();
drawPlayers();
drawScores();
stroke(255, 255, 255);
line(width/2, 0, width/2, height);

//Draw the ball
ball.draw();

if (!gameStarted) {
t++;
if (t >= PAUSE_TIME) {
t = 0;
gameStarted = true;
}
return;
}
if(player1Y) {
if (keyCode === UP) {
player1Y();
}
else if (keyCode === DOWN) {
player1Y();
ball.update();
}

}
};