Adult IQ and a strong plot make this a Vintage Space Classic No Spoilers:
Give it a chance, and allow for it's age and somewhat bleak acting. Props and stages are lacking but plausible. Accepting the film even with all it's grittiness and subpar pre-Star Trekian visuals will help. *Some old films wind up wasting the viewers time. *Some films are just annoying and asinine. But, 'some do surpass the IQ ceiling for late fifties & early sixties sci-fi movies. Yes! Some have good plots, even artistic, but can have lousy special effects, while others are the opposite, poor storylines but good, believable or even surreal special effects. This film seems to have an "even amount" of each category, including dialog and a reasonable 'traveling on a spaceship" believability. That's why I've labeled it adult. For the adult level IQ. Because it does not raise or lower your IQ flags along the way. The viewer will easily note that this film is intelligently scripted.
In a way the story will remind you (if your old enough) of those 35 cent Sci-Fi paperbacks with cool art covers you'd find by chance at the local second hand bookstore, and then found reading it was a joy and you wished the author would have written a sequel. Just like that paperback book you found by chance you'll take to this movie. Not a so called 'space opera' but rather a uniquely simplistic look into the future of space travel. Specifically to other planets within our own solar system. Not a super-stellar storyline but solid story telling. As with all film critics some viewers will think it's average, some will love it. Enjoying this particular film to the fullest is up to the viewer. While watching it forgive it for it's irregularities along the way and just go with it, you'll enjoy it more.