Source Code Help!

import pygame
import time

if 1 >= 1:
    print("Yes")

FPS = 30

block_size = 5

red = (255, 0, 0)
green = (0, 255, 0)
blue = (0, 0, 255)
black = (0, 0, 0)
white = (255, 255, 255)

window_width = 800
window_height = 600

font_size = 25
pygame.font.init()
font = pygame.font.SysFont(None, font_size)

pygame.init()

clock = pygame.time.Clock()
gameDisplay = pygame.display.set_mode((window_width, window_height))
title = pygame.display.set_caption("Slithering Snake!")


def message_to_screen(msg, colour):
    screen_text = font.render(msg, True, colour)
    gameDisplay.blit(screen_text, (window_width/2, window_height/2))

def gameLoop():

    lead_x = 100
    lead_y = 100

    change_x = 0
    change_y = 0

    gameExit = False
    gameOver = False

    while not gameExit:
        gameDisplay.fill(black)
        pygame.draw.rect(gameDisplay, red, (lead_x, lead_y, block_size, block_size))
        lead_x += change_x
        lead_y += change_y

        while gameOver == True:
            gameDisplay.fill(black)
            message_to_screen("Game Over! Press R To Play Again Or Q To Quit!", white)
            pygame.display.update()

            for event in pygame.event.get():
                if event.type == pygame.KEYDOWN:
                    if event.key == pygame.K_Q:
                        gameExit = True
                        gameOver = False

                    elif event.key == pygame.K_R:
                        gameLoop()

        pygame.display.update()
        for event in pygame.event.get():
            print (event)
            if event.type == lead_x >= window_width or lead_y >= window_height or lead_y <= 0 or lead_x <= 0:
                gameOver = True
            elif event.type == pygame.QUIT:
                gameExit = True
            elif event.type == pygame.KEYDOWN:
                if event.key == pygame.K_RETURN or event.key == pygame.K_ESCAPE:
                    gameExit = True
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_LEFT:
                change_x = -block_size
                change_y = 0
            elif event.key == pygame.K_RIGHT:
                change_x = block_size
                change_y = 0
            elif event.key == pygame.K_DOWN:
                change_y = block_size
                change_x = 0
            elif event.key == pygame.K_UP:
                change_y = -block_size
                change_x = 0

        clock.tick(FPS)

    message_to_screen("Game Over!", white)
    pygame.display.update()
    time.sleep(2)
    pygame.quit()
    quit()


gameLoop()