Hi Kanman, I'm a friend of SS454, welcome to the BBS!
The mix sounds to me like the stereo mix has been eq'ed too heavily. sounds like too much boost on the low end and too much cut in the mids.
That is, sounds this way to me. If that's not how you got this sound I would suggest working on the low end eq's of the stringed instruments to get a little separation. I would get more mid energy from the guitars. I recognize some POD in here and it kinda fuzzes the guitar tone too much for me.
I agree with the comments about the 50's sound of this. I'd love to hear the guitars more in that style of tone. This is just my opinion.
Sounds like a fun song, good job.