This is the first time you recorded vocals? You did a bang up job. At first, I didn't really like the male voice coming in, but then it kind of grew on me. (Oddly, it reminded me of Igorrr) GF has a good voice, too.
I did not care for the instrumentation much and the drums were a little low in the mix for my taste, and I agree with Bapu that the bass really needs more presence. Really didn't hear it much - although, full disclosure, I'm listening over little PC speakers.