Maybe I’m lured by the “Gulch” in the title, but I somehow see a sword&revolver setting for this, like the Dark Tower series.
Something about riding that damn Gulch towards the tower and one-shooting the first shadow before entering makes quite a nice picture.
The tower itself is brilliant in its out-of-bounds madness. I like the ups and downs in danger level (which the players wouldn’t know).
I love myself a nice wizard’s tower and this one is very nice. (It got two wizard’s!)