I really like this song, really nice chord progression and a pretty hooky laid back groove with some energy. Here are my comments, take them for what they're worth. :)
I have a soft spot in my heart for this kind of playing, melodic but gnarly when it's necessary. I also really like the set up for the ending. With a song with a restrained pace like this one I'd also look for places where some tasty drum fills and other percussive wizardry can add some forward movement, along with some rhythm guitar flourishes here and there, and topping it off with a more dramatic break somewhere in there to add excitement..
As for the mix, I think everything you need is there but as with the arrangement, I'd consider adding a bit more of it. A squeege louder on the drum and a tad more bottom on the bass. I'd also consider eq'ing in a little top end sparkle, but just a bit to add some space without killing the great vintage vibe that bass and guitar are nailing.
Anyway, that's what I think. Great work, thanks for sharing this with us!