Caterpillar game with Python

Caterpillar.py

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+import turtle as t
+import random as rd
+
+t.bgcolor('yellow')
+
+caterpillar = t.Turtle()
+caterpillar.shape('square')
+caterpillar.color('red')
+caterpillar.speed(0)
+caterpillar.penup()
+caterpillar.hideturtle()
+
+leaf = t.Turtle()
+leaf_shape = ((0,0),(14,2),(18,6),(20,20),(6,18),(2,14))
+t.register_shape('leaf',leaf_shape)
+leaf.shape('leaf')
+leaf.color('green')
+leaf.penup()
+leaf.hideturtle()
+leaf.speed()
+
+game_started = False
+text_turtle = t.Turtle()
+text_turtle.write('Press SPACE to start',align='center',font=('Arial',16,'bold'))
+text_turtle.hideturtle()
+
+score_turtle = t.Turtle()
+score_turtle.hideturtle()
+score_turtle.speed(0)
+
+def outside_window():
+    left_wall = -t.window_width()/2
+    right_wall = t.window_width()/2
+    top_wall = t.window_height()/2
+    bottom_wall = -t.window_height()/2
+    (x,y) = caterpillar.pos()
+    outside = x < left_wall or  x > right_wall or  y < bottom_wall or y > top_wall
+    return outside
+
+def game_over():
+    caterpillar.color('yellow')
+    leaf.color('yellow')
+    t.penup()
+    t.hideturtle()
+    t.write('GAME OVER!',align='center' , font=('Aerial',30,'normal'))
+
+def display_score(current_score):
+    score_turtle.clear()
+    score_turtle.penup()
+    x = (t.window_width() / 2)-50
+    y = (t.window_height() / 2)-50
+    score_turtle.setpos(x,y)
+    score_turtle.write(str(current_score) , align = 'right',font=('Arial',40,'bold'))
+
+def place_leaf():
+    leaf.hideturtle()
+    leaf.setx(rd.randint(-200,200))
+    leaf.sety(rd.randint(-200,200))
+    leaf.showturtle()
+
+def start_game():
+    global game_started
+    if game_started:
+        return
+    game_started = True
+
+    score = 0
+    text_turtle.clear()
+
+    caterpillar_speed = 2
+    caterpillar_length = 3
+    caterpillar.shapesize(1,caterpillar_length,1)
+    caterpillar.showturtle()
+    display_score(score)
+    place_leaf()
+
+    while True:
+        caterpillar.forward(caterpillar_speed)
+        if caterpillar.distance(leaf)<20:
+            place_leaf()
+            caterpillar_length = caterpillar_length + 1
+            caterpillar.shapesize(1,caterpillar_length,1)
+            caterpillar_speed = caterpillar_speed + 1
+            score = score + 10
+            display_score(score)
+        if outside_window():
+            game_over()
+            break
+
+def move_up():
+    if caterpillar.heading() == 0 or caterpillar.heading() == 180:
+        caterpillar.setheading(90)
+
+def move_down():
+    if caterpillar.heading() == 0 or caterpillar.heading() == 180:
+        caterpillar.setheading(270)
+
+def move_left():
+    if caterpillar.heading() == 90 or caterpillar.heading() == 270:
+        caterpillar.setheading(180)
+
+def move_right():
+    if caterpillar.heading() == 90 or caterpillar.heading() == 270:
+        caterpillar.setheading(0)
+
+t.onkey(start_game,'space')
+t.onkey(move_up,'Up')
+t.onkey(move_right,'Right')
+t.onkey(move_down,'Down')
+t.onkey(move_left,'Left')
+t.listen()
+t.mainloop()
+
+# Coded with 💙 by Mr. Unity Buddy