Galaxy Invaders

from turtle import *

t = Turtle()
t.up()
t.shapesize(2)
t.tilt(90)
t.speed(0)
t.goto(0, -240)
delay(0)
bullets = []
aliens = []
a1 = Turtle()
a1.speed(0)
a1.shape("square")
a1.shapesize(1)
a1.up()
a1.goto(0,280)
aliens.append(a1)



def move_left():
    t.bk(10)

def move_right():
    t.fd(10)

def shoot():
    bullet = Turtle()
    bullet.speed(0)
    bullet.up()
    bullet.shape("circle")
    bullet.goto(t.xcor(), t.ycor())
    bullet.setheading(90)
    bullets.append(bullet)
    bullet.shapesize(0.6)

def rozovo():
    t.color("pink")

def gameplay():
    for x in bullets:
        x.fd(10)
        if x.ycor() >300:
            x.hideturtle()
            bullets.remove(x)
    for x in aliens:
        x.fd(10)
        if x.xcor()>450:
            x.setx(-450)
            x.sety(x.ycor()-30)


    ontimer(gameplay,100 )

onkeypress(move_left, "Left")
onkeypress(move_right, "Right")
onkeypress(shoot, "space")
onkeypress(rozovo,"q")
listen()
gameplay()

done()