I don't know what "butterfies" means exactly but I'm very fond of "Stalker".

Stalker (1979 film)

Stalker is a 1979 Soviet science fiction art film directed by Andrei Tarkovsky loosely based on their 1972 novel Roadside Picnic. The film tells the story of an expedition led by a figure known as the "Stalker", who guides his two clients—a melancholic writer seeking inspiration, and a professor seeking scientific discovery—through a hazardous wasteland to a mysterious restricted site known simply as the "Zone", where there supposedly exists a room which grants a person's innermost desires.

The film combines elements of science fiction with dramatic philosophical, psychological and theological themes.

It surely had a tiny budget but it's so creative that it doesn't matter. It's otherwordly and unsettling due to the cinematography, music, etc. At one point a "special effect" created by small pieces of metal tied up with cloth. So much can be accomplished by good ideas, a gifted director, and a talented cast.

I hope Hollywood never does a remake because they'll give it a $100+m budget and the movie will be the typical souless husk of an idea pumped full of CGI and stupidity.