Agar.io made with python

import pygame
import sys
import random
# import os
# import time

pygame.init()
pygame.display.set_caption("Agar.io")

name = input("Player name: ")
line_draw = input("do you want to draw a line? ")


width = 600
height = 600
vel = 0.5
rows = 20
w = 500

screen = pygame.display.set_mode((height, width))

red = (255, 0, 0)
dim_red = (55, 0, 0)
green = (0, 255, 0)
yellow = (255, 255, 0)
blue = (0, 0, 255)
dim_blue = (0, 0, 55)
cyan = (0, 255, 255)
white = (255, 255, 255)
magenta = (255, 0, 255)
black = (0, 0, 0)

background_color = green

player_position = [265, 265]
player_color = [0, 0, 255]
player_size = 20

food_position = [random.randint(1, height), random.randint(1, width)]
food_sizes_list = [7, 7, 7, 7, 7, 7, 8, 8, 8, 9, 10, 10, 11, 12, 13, 14]
food_size = random.choice(food_sizes_list)
food_colors = [red, blue, white, cyan, dim_blue, dim_red, yellow, magenta]
food_color = random.choice(food_colors)
food_list = [food_position]

myFont = pygame.font.SysFont("arial", 30)
my_name = pygame.font.SysFont("arial", 30)


def detect_collision(player_pos, food_pos):
    p_x = player_pos[0]
    p_y = player_pos[1]

    e_x = food_pos[0]
    e_y = food_pos[1]

    if ((e_x >= p_x) and e_x < (p_x + player_size)) or ((p_x >= e_x) and p_x < (e_x + food_size)):
        if ((e_y >= p_y)and e_y < (p_y + player_size)) or ((p_y >= e_y) and p_y < (e_y + food_size)):
            return True
    return False


game_over = False

while not game_over:
    class Player:
        def draw_player(self):
            pygame.draw.rect(screen, player_color, (player_position[0], player_position[1], player_size, player_size))

    if detect_collision(player_position, food_position):
        player_size += food_size / 2

        food_position = [random.randint(1, height), random.randint(1, width)]
        food_size = random.choice(food_sizes_list)
        food_color = random.choice(food_colors)


    class Food:
        def draw_food(self):
            pygame.draw.rect(screen, food_color, (food_position[0], food_position[1], food_size, food_size))

    x = food_position[0]
    y = food_position[1]
    mouse_pos = pygame.mouse.get_pos()
    keys = pygame.key.get_pressed()

    if keys[pygame.K_LEFT]:  # and food_position[0] > 0:
        x += vel

    elif keys[pygame.K_RIGHT]:  # and food_position[0] < width - food_size:
        x -= vel

    elif keys[pygame.K_UP]:  # and food_position[1] > 0:
        y += vel

    elif keys[pygame.K_DOWN]:  # and food_position[1] < height - food_size:
        y -= vel

    elif keys[pygame.K_x]:
        sys.exit()

    food_position = [x, y]


    class Line:
        def draw_line(self):
            pygame.draw.line(screen, white, player_position, mouse_pos)


    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            sys.exit()
    screen.fill(background_color)
    pygame.display.update()

    text = "Player size: " + str(player_size)
    label = myFont.render(text, 1, black)
    screen.blit(label, (width - 600, height - 40))

    name_label = name
    label_name = my_name.render(name_label, 1, black)
    screen.blit(label_name, (player_position[0], player_position[1] - 50))

    player = Player()
    player.draw_player()

    food = Food()
    food.draw_food()

    if line_draw.lower() == "yes":
        line = Line()
        line.draw_line()