Cool song, and the observations about the Beatles are my thoughts exactly.
Mix-wise, I'd pull the bass down .5 db at most, and more of a drop to those congo/bongo? The congo/bongo reminds me of a horse galloping through your studio :) and in my limited experience I find reverbing up the bongos makes 'em sit better.
The ending - great! Love that sustained bass note! Your bass I think has a pretty good tone to begin with.
You have doubled your vocals in many spots but not all, and where you haven't it's noticeable, at least to me. You might add just a pinch of pitchshifting (like a Soundtoys Mircoshift or Eventide Harmonizer) but really a little is all you would need to thicken all the vocals up a tad. Your voice has a cool quality to it.
I'd like to hear where this one ends up! Cool tune!
cheers,
-Tom