To turn left, hold down the left arrow. To turn right, hold down the right arrow. Press the space key to shoot a fireball. If the fireball hits a bat, gost, or snake, it will be defeated. If you get hit by one, you will loose a life. If you loose 5 lives, the game will end. Have fun!
I got the idea from a book that had a few instructions on how to make games on Scratch.