I'm sorry if this sounds harsh, but your audio mix just doesn't work.

For two reasons, one is because you just took the sound/effects track from the completed movie and it just clashes with the picture, you can hear where the "ambiance" of the music changes because there was supposed to be a cut to a reaction shot or some footage of the aliens or whatever, and it's just distracting.
Two is because in some spots it's just too loud and you can't hear the set audio.
My suggestions: if you're gonna use the music from the movie, just use the cd soundtrack, ditch the sound effects (it's supposed to be a workprint, I'd say even the music is out of place!) and if you can, run all the set audio through a limiter/compressor.
It will help keep the voices at the same level (obviously try to avoid distortion).
I used this method when I edited a two hour show shot in a theatre, the actors didn't all know how to carry their voices, and some of them almost whispered, so the guy at the audio mixer just went crazy going up and down with the levels, and I had the insane job of making everything all match. Even after Eq and noise reduction, a compressor at the end of the line is what saves your ass.