Okay, I'll risk it— for a 50's drive-in flick, the movie's rather competently made, even on a severe budget. On the whole, it's well-acted, colorfully photographed, and briskly directed. On the other hand, the waggy-tail shrews are too doggy-like to frighten, unless you're a kitty cat. Fortunately, they're mostly photographed in quick shrouded fashion. Also, the "tank' makes for a funny and cleverly motivated appearance. At the same time, the plot itself is formula familiar— a scientific experiment gone wrong, along with a hero, a shapely blonde, and a bad guy, all trapped on an island with killer monsters at the door. To me, the formula works, even if about as familiar as my old shoes.
A couple of nice touches. The primitive "tank" may look silly, especially with its underpowered three person motor, but is an imaginative one-of-a-kind. Just don't look for it at a Nascar speedway. Note too, how the professor's boring exposition on the nature of shrews is enlivened by Ann's (Goude) fearful background behavior. Thus a dull pill gets some fizz.
As a 50's drive-in vet, I'm a bit puzzled how so many folks find the 69-minutes a camp classic. Sure, it's got amusingly goofy aspects. But frankly, I found it more entertaining than funny, even if forgettable.