itch.io

I'm not sure if anyone is still around here, but does anyone know the exact criteria for the achievement "without a scratch"? It says to "defeat every boss in the run without taking damage", but does that mean not taking damage only in boss fights, or throughout the entirety of the game? Do hits to shield layers count? How about self-inflicted damage, like from Apple of Desperation and Hell Pouch? Also, if Prox sees this, I just wanna say, absolutely excellent game you have here. Bravo.