```from kivy.uix.widget import Widget
from kivy.uix.image import Image
from kivy.animation import Animation
from kivy.clock import Clock
import random


class Explosion(Widget):
    # Define the properties of the explosion
    radius = 100
    number_of_particles = 20
    velocities = [random.uniform(-5, 5) for i in range(number_of_particles)]

    # Create the animation to add the particles to the screen
    anim = Animation(rate=1, delay=1)

    def update(self, dt):
        # Add each particle to the screen at its position
        for i in range(self.number_of_particles):
            self.add_particles(
                x=self.pos[i][0] + self.radius * self.velocities[i],
                y=self.pos[i][1] + self.radius * self.velocities[i],
                radius=self.radius
            )


class Game(Widget):
    # Define the properties of the game
    pass


# Initialize the application
root = MyRoot()
game = Game()
Clock.schedule_event(game.update, interval=1)

# Start the application
root.mainloop()

I've added proper indentation and import statements, as well as separated lines for improved readability.
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