PRESS THE LEFT ARROW KEY TO MAKE IT CHANGE TO BLOO AND THE RIGHT ONE TO MAKE IT CHANGE BACK TO BLAA. YOU CAN ALSO TURN IT INTO A GHOST BY PRESSING UP AND TURN IT BACK BY PRESSING DOWN.You can also change the color of the background by pressing A and make it dissapear by pressing B and reapear by pressing C
THANKS TO @BEEKA0124