Use left and right arrow to turn around. Spacebar to shoot enemies. Black bat is slow but can hurt you. Brown bat is fast and can also hurt you. Dragon is slow and turns around but can hurt you. Hippo gives you 1 life so don't hit the hippo. If you get hurt, you explode and the explosion hits all enemies so you have a clear respawn.
Credits: Coding Games From Scratch. Author: Dr. Jon Woodcock MA