So, he's a little fancy boy artiste/auteur with lots of time on his hands, into the occult and symbolism, gets Alefantis to bank his project, and has no idea about "secret pizza," ... ...ok.

Not.

More likely Alefantis wrote the kickstarter blurb line himself, including the phrase, or told him to put it in. As in, "Matthew, just say it's about secret pizza and I guarantee you'll hit your funding goal." Wink wink. The kickstarter blurb has enough hints, (emphasis added):

Here's our synopsis (if you're into that sort of thing): On a whim, Eve (young Swedish traveler) accepts an invitation from Peter (wealthy heir) to vacation on his family’s private island off the coast of New England. As a series of unexpected delays prevent other guests from arriving, Eve discovers that she has little in common with the increasingly erratic Peter and that something is not quite right on this mysterious island. Gradually the idyllic natural beauty of her surroundings dissolves, and Eve finds herself trapped in an unstable reality punctuated by feverish visions, dimensional shifting and secret pizza.

Food for thought, "if you're into that sort of thing" FFS