Hmm, I'm not sure
THe normal ending was fine enough, you can walk away from that and be fairly happy with it :p
But the bonus ending was a bit of "Ignore the previous ending, behold this cliffhanger!", there's a ridiculous number of uncerntainties and y'know, impatient as I am I don't want to wait to find out what happens :p
Still, there's plenty of interesting questions: What destroyed the island at the start? A Freak meteor storm or something more sinister? Who was the sleeping Merwoman at the end too? (Wasn't Naija, hair and clothes were different), What else did the Creator create that Naija didn't find? What's with Mia's freaky powers (Originally I'd assume she was one of the Priest's, but chances are she knew of the Creator's game all along, knowing full well the Creator would never destroy her...)
But yeah, liked the ending, didn't like the cliffhanger as much. Not since Beyond Good & Evil have I seen such a sadistic end as that

But that's me, and I'm picky like that

Would still play the sequal