I did much the same with mine except I toasted them before I carved the pumpkin. Also, I put them in hotter - maybe that's why they came out a bit hard.

I think mine were hard enough to do damage to the site of a healing dental implant. Got to be more careful!

Do you eat the whole seed, shells and all?

And WHAT is
shichimi togarashi?

Yes.

Red pepper-based Japanese spicy seasoning.