This isn't the tightest fit under progressive rock, but it works in that category. The boundaries of prog rock have shifted and changed over the years as things like Porcupine Tree bend one edge, while Radiohead challenges another. This has a moody kind of trippy, dreamy sound that reflects both of those angles without directly addressing either of them. There is a lot of Americana built into this. It leans on the mellower, slower end of the spectrum. Whatever you call it, though, it's intriguing and unusual music.
This review is available in book format (hardcover and paperback) in Music Street Journal: 2017 Volume 4 at lulu.com/strangesound.