| If you want to keep it garage-y sounding I wouldn't do a whole lot to it. The drums are a little dark and a little too far back. The rhythm guitar is okay I think, except that it was close mic'd and doesn't have any room ambiance around it, while the other instruments and the vocal sound pretty roomy. Not a huge problem since lots of good recordings are like that, but if you're going for more a lo-fi garage sound, I'd probably want to hear more room around the guitar. Kind of hard to recreate that after-the-fact though.
If you want a more produced sound, compression is going to be the key. Compressing the vocals will make a huge difference. I'd compress everything else too, and then put the whole mix through a limiter.
The bass level sounds about right to me, maybe a little bit too low actually -- but I'm listening on some little cube computer monitors with no low end.
Bass lines were pretty cool but the bass sounded a little out of tune with the rest of the track. Maybe just me imagining it though.
And I'd shorten the song by about two minutes. That's a catchy groove but it was starting to lose my attention about halfway through.
Oh yeah, and you might want to play with panning to keep things separate. I thought the vocal and the rhythm guitar were fighting each other for space a little bit. You might consider creating a virtual second guitar track with a chorus or delay, then panning the two tracks L and R. Then the guitars will be spread across the stereo image and the vocal will be centered and they won't be competing.
Anyway, that's my 0.02. | 
