Hollywood forgot how to make good low-budget movies
Up through the 1950's, the country had the wonderful pleasure of having a TON of studios, most of them specializing in churning out low-budget potboilers. Whether westerns, sci-fi, horror, comedy, serials, whatever-it was a great time in cinema, and will never be equalled again. Republic, Monogram, RKO, Allied Artists, American-International, Astor, etc; most all were entertaining, and occasionally you got a classic, either major or minor, I'd put this one in the minor category, due to its obvious limitations. Still, the thing that puts the older flicks head and shoulders above most of the new crap was-the makers of these old films loved their craft , and took it all quite seriously.
If this film, and many others, were to be made today, it would be filled with humor, mainly one-liners, as well as cheesy looking CGI and explosions. This old flicks' simplicity (as well as many others)is what makes it stand out, but that's just my opinion. I actually never saw this one until about the 70's, when it popped up on one of those 'shock theater' late-night Friday programs, and I was amazed at how well it still managed to hold your interest.