An ambiguous and confusing beginning leads to a very creepy, effectual, and disturbing Horror Movie that despite its very low budget manages to maintain an aura of surrealism and tension. The most disturbing element is probably the Children in Peril aspect as these Devil Worshipers use the Souls of the Innocent to reincarnate.
After the confounding first few scenes that in retrospect make more sense as things get going, it is one menacing and maniacal happening after another. There is a Post-Sixties Drug hangover that lingers here and it is quite unsettling.
The ending is shocking as is some of the hallucinatory, dream-like imagery and the indoor ritual Scenes have a setting of plastic-ism and play as a Children's demented Clubhouse. This is an underrated, undiscovered, and ultimately quite the quirk that helped issue in the Screen's Satanic Seventies.