1: luck. An extreme factor with this especially with the bosses attack cycle like kracko jr and marx soul if kracko jr does attacks in your favor and marx spawning just under you when he shoots his blades 2: hp sacrifice: you can use up some hp on somebody like kabula to kill him faster if your skilled. 3: skill, practice is vital to get better and better which i learned as i got better and better as i kept trying until i just had to rely on luck to get a better score I hope this helped, goodbye.