main.py

from kivy.app import App
from kivy.uix.widget import Widget
from kivy.uix.image import Image
from kivy.uix.behaviors import ButtonBehavior
from kivy.vector import Vector
from kivy.properties import NumericProperty
from kivy.core.audio import SoundLoader

class CookieButton(ButtonBehavior, Image):
    sound = SoundLoader.load('crunch.wav')

    def __init__(self, **kwargs):
        super(CookieButton, self).__init__(**kwargs)
        self.source = 'cookie.png'
        self.original_size = Vector(self.size)
        self.clicked_size = Vector(self.size) * 1.2

    def on_press(self):
        self.parent.score += 1
        self.size = self.clicked_size
        self.center = self.parent.center
        self.sound.play()

    def on_release(self):
        self.size = self.original_size
        self.center = self.parent.center

class ClickerGame(Widget):
    score = NumericProperty(0)
    pass

class ClickerApp(App):
    def build(self):
        return ClickerGame()


if __name__ == '__main__':
    ClickerApp().run()