Compared to the previous cage fight game, not too many differences in terms of gameplay. Besides the obvious change in heroine design, the following stood out for me.
1. Like the previous games, having max agility and at least all of the skills at level 1 makes winning story mode 1 a breeze. Story modes 2 and 3 might need spirit gauge maxed out as insurance, but it's still ludicrously easy to get a perfect win even without raping her.
2. She has a mount position judo-throw counter if players mess around for too long instead of finishing her. This is highly damaging and cannot be reversed, not bad since the previous iteration did not have this. Likewise, her mount position to MMA arm breaker doesn't have the rape reversal the previous iteration had, so there's no merit to letting her tackle the player.
3. More wrestling moves compared to the previous iteration. Bear hug is new, as is the sleeper chokehold. More options from previous games like unconscious sex are also available when they didn't exist back in the first game. Grapple mode isn't an advantage since she can still attack while held, so players might as well use the finishers immediately, necessitating a full SP gauge to do everything quickly.
4. The endings are more streamlined now. The previous game required players to beat EX mode 7 times for the true end, which was hard even with ALL stats maxed out. This one just requires giving her a beatdown without raping her in story mode 3 for the love end.
5. Same HP armour break system as previous games, whereas the previous iteration made it really easy to strip the opponent naked. Not too difficult even at base strength to strip her naked, since each piece of clothing only requires at most 6 strikes to rip.
Unity is a huge improvement over Flash, and now that he's used to it he can churn out the games until he gets burnout again.