Звёздное небо и нло

import pygame
from pygame.locals import *
import sys
from tkinter import Tk
from random import randrange as rnd
from random import choice
from random import randint as rnd2
 
 
tk = Tk()
SIZE = WIDTH, HEIGHT = tk.winfo_screenwidth(), tk.winfo_screenheight()
STARS_COUNT = 300
star_list = []
POSITION = [rnd2(350, WIDTH - 350), rnd2(350, HEIGHT - 350)]
 
 
class Star:
    def __init__(self):
        self.x = rnd(WIDTH)
        self.y = rnd(HEIGHT)
        self.s_color = (rnd(255), rnd(255), rnd(255))
        self.flag = choice([True, False])
 
    def draw(self):
        pygame.draw.circle(screen, self.s_color, [self.x, self.y], 1)
 
    def blinking(self):
        if self.flag:
            self.s_color = (rnd(255), rnd(255), rnd(255))
 
 
pygame.init()
screen = pygame.display.set_mode(SIZE, FULLSCREEN)
nlo = pygame.image.load('nlo.png')
 
for _ in range(STARS_COUNT):
    star_list.append(Star())
 
 
while True:
    for ev in pygame.event.get():
        if ev.type == QUIT or (ev.type == KEYDOWN and ev.key == K_ESCAPE):
            sys.exit()
 
    for st in star_list:
        st.draw()
        st.blinking()
    screen.blit(nlo, POSITION)
    pygame.display.flip()