Comment by Trasmatta

I think there's a lot more to Eraserhead than that! I also don't really see the ending as pessimistic personally.

Lynch: "Believe it or not, Eraserhead is my most spiritual film."

Lean: "Elaborate on that?"

Lynch: "No, I wont. No one sees it."

https://www.youtube.com/watch?v=jjoMEw2RYlA