For Eraserhead, I understand the metaphor of how parenting can be larger-than-life and terrifying and I see how Eraserhead was trying to embody that but I very much didn't appreciate the highly pessimistic ending. It's an early movie that would have benefited immensely from an alternate ending on its DVD.
Lynch: "Believe it or not, Eraserhead is my most spiritual film."
Lean: "Elaborate on that?"
Lynch: "No, I wont. No one sees it."
It isn't the elusive puzzle that many cinephiles value in his work, but it is clearly a Lynch film, even if it's not a stereotypical one.
Watch a few interviews where he is asked what a film of his means. A smirk comes on his face and he repeats his mantra.
He never let on.
Unless you are a narcissist (probable billionare) who feels the need to go back and explain every detail about the wizarding world you created a few decades later and reveal what kind of piece of crap you are.
These days you'll have to be more specific.