Only commenting on the mix:
Bright, but nicely balanced.
At 0:20.
"Illinois" is a bit buried. Then again, it shows up enough for the listener to figure it out.

Piano sits nicely in the mix. I like the bits of guitar that sneak through.
At 1:31, the word
"fill" is also a touch behind the instruments. Combined with the pronunciation as
"feel", it took a moment longer to process than the rest of the lyrics.
Slide guitar sits
so nice in the mix.
The chicken picking guitar sneaks in again at 3:24 - nice. Same for the piano fills.
Switching settings on my headphone software, in "Mono Cube" mode (which cuts a lot of bass), the
/S/ pops out a lot, so you might want to look there. Not hearing any issues in mono. Sounds good in "Lo Fi" mode as well.
The bass seems a bit "tubby" to me. I know it's traditional country, but still.
My son's comments: The low/mid area could be brought up a bit. A bit of sibilance of the vocal. It could also be a bit wider, but that's a personal preference.
Non-mix comment: the ending seems overly long to my highly unqualified ears. At 3:30, you could have ended with an a capella
"Of Illinois", or put a piano tag after it. Or at the recap at 3:40. But to go another round or two for the instruments - despite how lovely the "ooohs" are, seems to much.
Then again, I thought
Against The Wind could also could have done with a quicker fade.

All in all, a nice sound on a nice song. Really well arranged, lots of nice things listen to!
