Demon Killer has you trapped in a frightening place where a skeleton is following you. You can only escape by shooting blindly at the monsters. You will encounter a lot of skeletons during the game. Some of them will be very easy to kill, while others can cause problems. This means that you must put in your best effort to defeat them. You also need to work on acquiring a range of skills to make yourself more powerful. Don't be afraid to show off your shooting skills. Have fun!