If you lose you get 0 stars
If you win you get 1 star and additional:
+1 star if your HP is 50% or higher
+1 star if there were 3 or less rounds (5 or less round in fights with bosses)
+1 star if you didn't hit your opponent's shield
+1 star if you didn't receive a hit except your shield
You can not get more than 3 stars.
Posted on Apr 1, 2016