snake 2 from turtle

import turtle
import time
import random

delay = 0.1
game_started = False

score = 0
hi_score = 100

wn = turtle.Screen()
wn.title("THIS IS THE TITLE")
wn.bgcolor("blue")
wn.setup(width=600, height=600)
wn.tracer(0)

#snake_head
head = turtle.Turtle()
head.speed(0)
head.shape("triangle")
head.color("black")
head.penup()
head.goto(0,0)
head.direction = "stop"

segments = []

#food
food= turtle.Turtle()
food.speed(0)
food.shape("circle")
food.color("green")
food.penup()
food.goto(0,0)

#text
penText = turtle.Turtle()
penText.speed(0)
penText.shape("square")
penText.color("white")
penText.clear()
penText.penup()
penText.hideturtle()
penText.goto(0, 260)
penText.write("Press spacebar to start!", align="center", font=('Times New Roman', 25, "bold"))

def move_up():
    if head.direction != "down":
        head.direction = "up"

def move_down():
    if head.direction != "up":
        head.direction = "down"

def move_left():
    if head.direction != "right":
        head.direction = "left"

def move_right():
    if head.direction != "left":
        head.direction = "right"

def move():
    if head.direction == "up":
        head.sety(head.ycor() + 20)
        head.setheading(90)
    if head.direction == "down":
        head.sety(head.ycor() - 20)
        head.setheading(270)
    if head.direction == "left":
        head.setx(head.xcor() - 20)
        head.setheading(180)
    if head.direction == "right":
        head.setx(head.xcor() + 20)
        head.setheading(0)

    for segment in segments:
        if segment.distance(head) < 20:
            time.sleep(1)
            head.goto(0, 0)
            head.direction = "stop"

            for segment in segments:
                segment.goto(1000, 1000)




def placeFood():
    food.hideturtle()
    food.setx(random.randint(-270, 270))
    food.sety(random.randint(-270, 270))
    food.showturtle()

def gameOver(score, hi_score):
    penText.clear()
    penText.write("Score: {} Hi-score: {}".format(score-5, hi_score), align="center",
                          font=("Consolas", 25, "bold"))
    turtle.clear()
    turtle.penup()
    turtle.color("white")
    turtle.write("GAME OVER!", align="center", font=("Comic Sans MS", 25, "bold"))

    turtle.hideturtle()
    head.goto(1000,1000)
    head.color("blue")
    head.direction = "stop"
    food.goto(500,500)





def startGame():
    global game_started, delay, score, hi_score
    if game_started:
        return
    game_started = True
    penText.clear()


    while True:
        wn.update()
        if head.distance(food) < 20:
            placeFood()
            newSegment = turtle.Turtle()
            newSegment.speed(0)
            newSegment.shape("circle")
            newSegment.color("white")
            newSegment.penup()
            segments.append(newSegment)

            if score > hi_score:
                hi_score = score

            penText.clear()
            penText.write("score: {}  Hi-score: {}".format(score, hi_score), align="center",
                          font=("Consolas", 25, "bold"))
            delay -= 0.001
            score += 5

        for i in range(len(segments)-1, 0, -1):
            segments[i].setx(segments[i-1].xcor())
            segments[i].sety(segments[i-1].ycor())

        if len(segments) > 0:
            segments[0].goto(head.xcor(), head.ycor())


        #collision
        if int(head.xcor()) > 290 or int(head.xcor()) < -290 or int(head.ycor()) > 290 or int(head.ycor()) < -290:

            time.sleep(0)
            game_started = False
            gameOver(score, hi_score)

        move()



        time.sleep(delay)



wn.listen()
wn.onkeypress(move_up, "w")
wn.onkeypress(move_down, "s")
wn.onkeypress(move_left, "a")
wn.onkeypress(move_right, "d")
wn.onkeypress(startGame, "space")


wn.mainloop()