I can almost hear the pitch "Shane meets Fourth of July" and you wouldn't be far off if you approached it like that. Man with amnesia and initially no name rides into a town. On his arm is a strange metal device. The stranger finds out who he is and he's not sure he likes it. Add to it a strange woman, Ella, and some Apache Warriors, all of whom have to fight for survival against some aliens who just want the gold.
I enjoyed the read, it was pretty harmless and now I'm looking forward to the film.