But its true.
Poke holes if you can.
...
Fine.
First, off Kid is hott.
That's "hot" and it's irrelevant unless Serge is completely and totally shallow, which he is most likely not given what we can garner about his personality from his actions.
Second, the game is basically trying to save her.
No, the game is about saving Schala and eliminating the last remaining shadow of Lavos, not about saving Kid. Remember, you can choose to not save her.
Third, if a guy saved a girl then she would fall in love him. It is simple fact.
As I said before, this is nothing but blatent sexism. First, this presumes that all women must be heterosexual, which we know is not true(though it is true in Kid's case.) Second, this presumes that every woman has this damsel in distress syndrome, which we know they do not. Kid has a very strong personality, and while she'd undoubtably be appreciative of anyone who saves her from a fate, she is NOT going to fall in love purely on that reason. It's childish to believe otherwise.