Instructions
Destroy the small red circle next to your character when the battle begins. Simply hit the circle with your main weapon until it is destroyed.
Repeat the process with the other three circles in the other three corners of the fighting area. They are easy to destroy with your main weapon, just like the first circle.
Stand under the hole after destroying the four circles and attack it with your main weapon. After you have struck the hole enough times, it will close, ending the game.