Snake game built with Pixi.js

spec:

• Snake can be controlled by arrows.
• Snake food will be placed randomly on screen.
• Snake food has a random timeout between 4 to 10 seconds
• Snake elongates itself after eating the food.
• Every food intake gives 1 point.
• If the snake hits a boundary, the size of the game area should reduce by 113px and the direction of the snake reverses.
• Game is over when snake gets in contact with itself.
• Dimensions of food should be equal to dimension of one segment of the snake.
• Dimension of food should be 16px X 16px.
• The game area should be of size 800px X 800px.
• "Play Again" button should appear once the game is over.
• In the subsequent gameplays, if the score is greater than the previous gameplay score, then change the color of the score.