Doukutsu ending HELP (Spoiler alert)

Yeah, I need help to get the perfect ending in Doukutsu Monogatari (Cave Story)... I got to the point where I defeated the core, got away with Sue (Toroko has died, I think. She just dissapeared), but Curly is still in Core's previous home. All the other Mimiga's are in the chopper with Sue's mother and Itoh, while me, Sue and Kazumi are flying with the dragon... What is the perfect ending? Can curly be saved? Need some help, since they aren't telling me how it should end (I mean, I also ended it by escaping with Kazumi on his dragon without helping the others).
Wheeeeee...

I'm Japanese,and my English ability is very poor.
Although it may be unable to tell well, is still it good?