Never-released films like "Mr. Angel" are curious beasties, since many years later it is a challenge to try and figure out what went wrong - why they didn't pass minimal muster in an industry where so much trash DOES see the light of day. I lost patience, however, leaving the heavy lifting of making some sense of "Mr. Angel" to some other structurally- minded film critic.
It's basically a would-be action film shot in Florida (Bahamas is also listed) with a handsome hero and heroine killing time in a non-story. What passes for plot and a couple of plot twists is execrable, and I find it hard to imagine sitting in a theater nearly 50 years ago for its entire duration. Presumably potential buyers and distributors back in the '60s auditioning this indie production stopped watching after a couple of reels.
Structurally, "Mr. Angel" is more aptly described as mere footage rather than a feature film. Many scenes, especially in the first half, are so aimless, padded and failing to move the narrative forward that I felt like I was watching assembled rushes, not an edited final product. The heroine ambles around killing time and threatening (alas, unrealized) to show the fans some actual skin, but this is strictly G-rated (before the ratings were instituted).
Both she and our untalented title hero are blond, Aryan types, giving the overall effort almost a heimat-feel: it's strictly about the scenery. Ultimately it fails even on the level of a travelogue.