So, this Silent Hill doesn´t have any UFO ending, right ?

Well, what if it has one ?

How do you think it wold be? your own UFO ending, maybe ?

I don't know why this idea popped into my head, but OK, let's say Henry found himself a channeling stone, and uses it at key points throughout the first round of worlds.
After the last key spot, he's nabbed by a beam of light and transported up into an alien ship.
Aboard, he finds Elaine, Cynthia, Jasper, Walter, and all the other characters alive and well, happily enjoying a tea party, which they ask him to join.
He sits down, looking mildly perturbed, and in the middle of all the merriment, quietly excuses himself, locates the ship's main controls, and initiates the self-destruct sequence.
He leaves in an escape pod, the ship explodes behind him, and he lands back in Silent Hill.
When he returns to his apartment, he finds an eviction notice on the door.
He snaps, torches the entire building, gets in his car, and leaves town, muttering silent expletives the whole way.
There, that's my take. *shrugs*