I think that it's a kind of evisceration fantasy. Spaghetti resembles all sorts of internal organs and the seafood is usually a bunch of half-recognisable disemboweled creatures. You whip it into a frenzy of bloody flesh and half debunk the myth that it's food, rather than a metaphor for casual excoriation, pain and disintegration, and then tease us with friendlier meta-forms telling us that it's all in fact it's all okay. It is just what you had for lunch. That's all.
That's such an interesting comment and interpretation. When I looked at it again I could totally see it from your angle, which WAS a lot of what I was going for, but most people saw the result only as comic.