Rewrite the snake sketch in a way that the "snake" stops at the edge of the window and the last rectangle turns red.
Write 2 visual effects for the webcam image (or a still image).
Use image data for the background, ball and player of the Arcade Game. (Including parallax background, sounds and keyboard controls.)
Now use sounds in the arcade game. Make it sound, when the ball hits the wall and the player.
Use FFT values with an own track for own visual parameters