Adding some lines of code to the game

Let’s give a little of more code to our very simple game, making the alien want to catch the other aliens falling from the sky… instead of landing on the one o the ground.
# python filename.py
import pgzrun
from random import randint
WIDTH = 800
HEIGHT = 600
alien_hurt = Actor('alien', midbottom=(WIDTH // 2, HEIGHT))
alien = Actor('alien_hurt')
alien.topright = 100, 10
xpos = randint(0, 800)
score = 0
lor = randint(0, 1)
somewhere = randint(0, 0)
def draw():
screen.fill('blue')
alien.draw()
alien_hurt.draw()
def update():
global score, somewhere
alien.y += 5 + somewhere
alien.x += somewhere
if alien_hurt.x > 30:
if keyboard.left:
alien_hurt.x -= 5
if alien_hurt.x < 770:
if keyboard.right:
alien_hurt.x += 5
if alien_hurt.colliderect(alien):
score += 1
respawn()
if alien.y > 600:
score -= 1
respawn()
if alien.x < 30 or alien.x > 770:
somewhere = -somewhere
def respawn():
global somewhere
print(score)
alien.y = 0
xpos = randint(0, 800)
alien.x = xpos
somewhere = randint(-3, 3)
pgzrun.go()