This movie is a great slice of '80s cheese. Lots of action, fun gooey alien FX and decent interplay between Kyle McLachlan and Michael Nouri.
As well as a super creepy moment of a dog just sitting and staring at itself in the mirror. I'll never sleep again.
If I must nitpick (and I must), I'm fascinated by the idea of a species whose evolutionary trajectory has been to parasitically conceal themselves within other organisms, and somehow they remain completely incapable of "blending in." I like to imagine that these are those bugs from that dropped TNG plot, who got a lot better at their job with just 300 more years of practice.
Also, even with the ambiguous nature of the ending, I can't be 100% sure that McLachlan's character wasn't nudging events toward this particular outcome. Despite being substantially more durable than average, he seemed to be in no hurry to take a bullet for anybody else.