Write a space invader game

import time
import sys
import random

# print instructions
print ("Welcome to the number guessing game!")
print ("I'm thinking of a number between 1 and 10.")
print ("You have three lives. Good luck!")

# generate a random number
number = random.randint(1, 10)

# variables
tries = 3

# game loop
while tries > 0:
  # get guess
  guess = input("Guess a number: ")
  guess = int(guess)
  # compare guess to number
  if guess == number:
    print ("You win!")
    sys.exit()
  elif guess > number:
    print ("That was too high. Try again.")
  elif guess < number:
    print ("That was too low. Try again.")
  # subtract one from tries
  tries = tries - 1
  
print ("You lose.")
print ("The number was " + str(number) + ".")