First off, this is an excellent song and performance. I'm a big fan of R.E.M., the Byrds, the Searchers and Robyn Hitchcock, so I really enjoy this sort of number.
I have a couple of minor critiques: I feel there are places where the lead vocal doesn't make a lot of impact, and it's usually when the guitars get a bit heavier. (The Aral Sea section is one example.) It sounds beautiful and mellow in those areas, but I would imagine you'd want the lyrics to be heard (they too are really fine). I might try boosting a little 5k in some of these areas, or some of the air frequencies. Or, you may want to reduce some of the 240 boominess, and then turn the lead vocal up just a bit, in places. I wouldn't make radical changes to these frequencies, but a little tweaking can go a long way.
The instrumentation sounds great to me. One of the guitars in the Aral Sea section seems a bit loud. It's on the right side, and is a string-bending lead right around the phrase "broken springs of time." I would turn it down just a tiny bit, very little. If you feel it doesn't have the impact you're looking for, tweak the eq at the lower volume and see if it's any better. If you don't notice an improvement, just leave it the way it is, because it's a pretty minor issue, and it may just be a matter of taste that decides it.
The ending is abrupt, and that is not necessarily a bad thing, but there is a click on the left side that sounds like hitting stop on a recording machine. This is at the tail end and a bit distracting. I'd get rid of that sound if you can.
Here's an opinion that might fly in the face of conventional wisdom, but I liked the weird vibrato. The nervousness enhances the mood and makes it sound more personal. I wouldn't worry about redoing the vocal, unless there's one occasional little phrase or tick you just can't stand. It's up to you, but as an unbiased outside observer, I don't think there's anything needed to improve the vocal performance.