Really Simple Snake Game

import pygame
import time
import random

# Initialize Pygame
pygame.init()

# Define colors
white = (255, 255, 255)
yellow = (255, 255, 102)
black = (0, 0, 0)
red = (213, 50, 80)
green = (0, 255, 0)
blue = (50, 153, 213)

# Set the screen size
dis_width = 600
dis_height = 400
dis = pygame.display.set_mode((dis_width, dis_height))
pygame.display.set_caption('Snake Game')

# Set the clock
clock = pygame.time.Clock()

# Snake block size and speed
snake_block = 20  # Increased block size for larger snake and food
snake_speed = 8  # Snake speed

# Font for displaying score
font_style = pygame.font.SysFont("bahnschrift", 25)
score_font = pygame.font.SysFont("comicsansms", 35)

# Function to display the current score
def Your_score(score):
    value = score_font.render("Your Score: " + str(score), True, white)
    dis.blit(value, [10, 5])

# Function to draw the snake
def our_snake(snake_block, snake_list):
    for x in snake_list:
        pygame.draw.rect(dis, green, [x[0], x[1], snake_block, snake_block])

# Function to display the game over message
def message(msg, color):
    mesg = font_style.render(msg, True, color)
    dis.blit(mesg, [dis_width / 6, dis_height / 3])

# Function to display the start screen
def start_screen():
    while True:
        dis.fill(blue)
        message("Welcome! Press ENTER to Start :-)", white)
        pygame.display.update()

        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                pygame.quit()
                quit()
            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_RETURN:  # Enter key to start the game
                    return  # Exit the start screen and start the game

# Game loop
def gameLoop():
    start_screen()
    game_over = False
    game_close = False

    # Initial position of the snake
    x1 = dis_width / 2
    y1 = dis_height / 2

    # Snake movement variables
    x1_change = 0
    y1_change = 0

    # Snake body list
    snake_List = []
    Length_of_snake = 1

    # Random food position
    foodx = round(random.randrange(0, dis_width - snake_block) / 20.0) * 20.0
    foody = round(random.randrange(0, dis_height - snake_block) / 20.0) * 20.0

    while not game_over:

        while game_close:
            dis.fill(black)
            message("You Lost! Press Q-Quit or C-Play Again", red)
            Your_score(Length_of_snake - 1)
            pygame.display.update()

            for event in pygame.event.get():
                if event.type == pygame.KEYDOWN:
                    if event.key == pygame.K_q:
                        game_over = True
                        game_close = False
                    if event.key == pygame.K_c:
                        gameLoop()

        # Handle user input
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                game_over = True
            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_LEFT:
                    x1_change = -snake_block
                    y1_change = 0
                elif event.key == pygame.K_RIGHT:
                    x1_change = snake_block
                    y1_change = 0
                elif event.key == pygame.K_UP:
                    y1_change = -snake_block
                    x1_change = 0
                elif event.key == pygame.K_DOWN:
                    y1_change = snake_block
                    x1_change = 0
 
       # Check for wall collision
        if x1 >= dis_width or x1 < 0 or y1 >= dis_height or y1 < 0:
            game_close = True
        x1 += x1_change
        y1 += y1_change
        dis.fill(black)
        if (Length_of_snake - 1) % 5 == 0 and Length_of_snake != -1:
            pygame.draw.rect(dis, red, [foodx, foody, snake_block, snake_block])
        else:
            pygame.draw.rect(dis, yellow, [foodx, foody, snake_block, snake_block])
        snake_Head = []
        snake_Head.append(x1)
        snake_Head.append(y1)
        snake_List.append(snake_Head)
        if len(snake_List) > Length_of_snake:
            del snake_List[0]

        # Check for self-collision
        for x in snake_List[:-1]:
            if x == snake_Head:
                game_close = True

        # Draw the snake and update the screen
        our_snake(snake_block, snake_List)
        Your_score(Length_of_snake - 1)
        pygame.display.update()

        # Check if the snake eats the food
        if x1 == foodx and y1 == foody:
            if (Length_of_snake - 1) % 5 == 0:
                foodx = round(random.randrange(0, dis_width - snake_block) / 20.0) * 20.0
                foody = round(random.randrange(0, dis_height - snake_block) / 20.0) * 20.0
                Length_of_snake += 2
            else:
                foodx = round(random.randrange(0, dis_width - snake_block) / 20.0) * 20.0
                foody = round(random.randrange(0, dis_height - snake_block) / 20.0) * 20.0
                Length_of_snake += 1

        clock.tick(snake_speed)

    pygame.quit()
    quit()

# Run the game loop
gameLoop()