"Have a Coke", make some popcorn, relax and suspend disbelief. The unlikely unfolding of events and less-than award-winning acting is part of the fun of this kind of film -' very much in the genre of the 1950's science fiction movies.
Here are science-y people doing impossible, scientific-like things with technological-looking hardware which results in unforeseeable consequences of cosmic proportions. But, unlike modern "sci-fi" movies that rely heavily on computer-generated worlds, violence and prurience, this little film relies almost completely on plot and characters. That makes for a terrific bit of entertainment in my book.
(I put "sci-fi" in quotes as most films of that kind today rely almost entirely on magic with not even the suggestion of anything scientific.).
Review by rickaholland from the Internet Movie Database.