Yup, the new title screen is pretty awesome when you win the game. Takes a while but a pretty good reward.
EDIT: Actually, you don't have to go through the entire game, nor do you have to win. I just skipped straight to AluaLane and fought her, then lost to Dark Tiki to see what would happen. You get the same screen as winning.
As for the changed behaviors, from what I can tell, the Drinking Worms are a little less spit happy and a little more drink happy, so definitely watch out there. Spitting still stops the raping, but they're much smarter with it now. They won't spit really close up anymore.
The new move for the Naga is a bit annoying but as long as she doesn't get you in a corner, it's not hard to avoid. As for beating her...well, she doesn't really spam her worm whenever you're far away so the only 'effective' plan I've found so far is to jump repeatedly near her so she grabs you and fists you, then once it's over, she's vulnerable to a rising punch. The damage she does is a lot less than the damage you'll do so it works out. Just make sure you jump backward or else she might grab you the other way and start licking. Sometimes she does her punching move but it does little damage.
AluaLane's new move is hooot! So glad we can now skip to her stage, it's awesome. She really needs a game over rape at this point though. She's got enough moves, all we need is a game over scene and she'd be perfect.