I'm looking through the videos of returning hissatsu and I noticed a lot of tiny details. Some I can't tell if they're new or were always meant to be there but the DS graphics made it hard to notice.
The ball in Gravitation looks like it's constantly being pushed downwards by the force, the two players jumping off Perfect Tower now briefly look charged up with its electricity before kicking it at the enemy.
My favorite is what they did to Heaven Drive. While not 1-to-1 with the anime version, since the ball doesn't make the clouds swirl from being hit by it and the choreography isn't as intense, they did add the anime's stairway to heaven effect as the ball reaches the sky. Singlehandedly makes a boring hissatsu into a 10/10.