Cool little tune!
Is that an edit in the guitar track at 4 seconds in? It sounds really jarring.
I like the tone of the acoustic; it sounds very organic. Is there a bass at all? I'm thinking no?
Doubled vocal sounds nice in the chorus. When it split to the harmonies later, though, it sounded a little odd. I'm not sure why, but it didn't really blend as harmony parts; it sounded more like just several individual parts singing different lines at the same time. Maybe it's the panning? I don't know.
Anyway, I know I'm gonna figure out which McCartney song it was that inspired this. It's on the tip of my tongue! (Don't tell me!)
Edit: That chorus is incredibly catchy, by the way!