(This is not a review since I haven't seen the film. It's on the film festival circuit, so I probably won't see it for a while. I'm describing it via the trailer, interviews, and PR on the film's site. My apologies if I get something wrong.)
The film follows Tyrone S. (Riley O'Bryan) as he looks for and finds a miniature V-2 rocket, then has to carry it around a forest in search of the second one. Along the way he encounters various unusual characters and eats bananas.
IMPOLEX's writer/director, Max Ross Perry, freely admits in interviews that he was heavily influenced by Pynchon's Gravity's Rainbow -- besides thematic similarities, the main character's name is the same in both and the title was obviously inspired by Pynchon's Imipolex G, although Perry's IMPOLEX (short for "Initiative for the Monitoring and Protection of Liquid Energy Explosives") is a US military organization, not a secret Nazi erectile plastic.
What's drawn my interest in this film is that one of the characters Tyrone encounters is a talking tree octopus, of unknown European species, voiced by Eugene Mirman and played by two octopuses -- which I assume is some sort of union thing. One still shows them sitting together in the forest, engaged in a deep discussion:
I don't know what they discuss, but apparently they have a falling out. In the trailer at about 1:40, Tyrone shoots at the octopus:
There's also a viral-ish US Army issued warning explaining IMPOLEX, with two extended scenes and subliminal octopus frames (that's Perry playing Dr. Calvin Zoyd of the US Military):