I first saw this many years ago on Elvira's early 80's series
Movie Macabre (anybody else remember this MST3K ancestor?). I recently rewatched it and am happy to say it still gave me a laugh. I particularly like the way the killer avacodos wheeze and moan like they have asthma.
It does drag a bit, but that one-eyed psychic creech-ture at the end is well worth the wait. It's like a slimier, slightly uglier version of 'Beluah' from Corman's IT CONQUERED THE WORLD, or maybe a relative of
The Simpson's Kang and Kodos.