Lemmini++ maybe?
That might work, although NaOH does have a good point against it:
But that will get abbreviated as "L++," which could cause confusion.
Lemminae?
Is that the plural form of lemmini? In any case, I think "Lemmini" should still be part of the title since this isn't a completely new clone.
SuperLemmini?
Sounds good to me. I'll consider it.
"Lemmini: LF Edition"?
What is "LF" supposed to stand for? If it stands for "Lemmings Forums," then I don't think it's a good name; I'd rather not name it after a forum site.
Lemmega hehe
See my point above regarding "Lemminae."
What about (Lemmini Revisited)
"Revisited" doesn't sound good to me since we're not really "revisiting" anything.
Oh No! More Lemmini
This may work, as long as people don't abbreviate it "ONML" (which they likely will).