I like the American feel of the tale. I read a lot of westerns back in the day; not so keen about them as much as I used to be. I am now into fantasy, so I still find a connection with your story.
I also like the fact that it reads like a children story with so many amazing things that are quite difficult to believe and the grandson makes a perfect audience, a true replica of a child's innocent curiosity and willingness to believe anything. Beautiful @geekorner