Color game using Tkinter

import tkinter

import random

colours = ['Red','Blue','Green','Pink','Black',

'Yellow','Orange','White','Purple','Brown']

score = 0

timeleft = 30

def startGame(event):

if timeleft == 30:

countdown()

nextColour()

def nextColour():

global score

global timeleft

if timeleft > 0:

e.focus_set()

if e.get().lower() == colours[1].lower():

score += 1

e.delete(0, tkinter.END)

random.shuffle(colours)

label.config(fg = str(colours[1]), text = str(colours[0]))

scoreLabel.config(text = "Score: " + str(score))

def countdown():

global timeleft

if timeleft > 0:

timeleft -= 1

timeLabel.config(text = "Time left: "

+ str(timeleft))

timeLabel.after(1000, countdown)

root = tkinter.Tk()

root.title("COLORGAME")

root.geometry("375x200")

instructions = tkinter.Label(root, text = "Type in the colour"

"of the words, and not the word text!",

font = ('Helvetica', 12))

instructions.pack()

scoreLabel = tkinter.Label(root, text = "Press enter to start",

font = ('Helvetica', 12))

scoreLabel.pack()

timeLabel = tkinter.Label(root, text = "Time left: " +

str(timeleft), font = ('Helvetica', 12))

timeLabel.pack()

label = tkinter.Label(root, font = ('Helvetica', 60))

label.pack()

e = tkinter.Entry(root)

root.bind('<Return>', startGame)

e.pack()

e.focus_set()

root.mainloop()