Being in an enclosed area surrounded by heavy snow is essential in the paranoia and tension between characters. A member of the group isn't who or what they say they are. One of them is an alien creature with the ability to replicate others. They go insane by not being able to trust each other. The alien creature is portrayed by practical special effects. Even after 36 years, the special effects still look great.
Mostly impressed with the composition, lighting, and use of fades. Standard Willem Dafoe performance. His voice was his only purpose really for voice over. This felt like Fellini or the Great Beauty with the weird sex parties. The comet gave a biblical sense to the film much like the flamingos in the Great Beauty.