hah - yep being able to damage the boss before the fight starts was an oversight, i noticed it during later testing but figured it was minor enough to leave unfixed for jam submissions (optional difficulty modifier? perhaps)
probably will add headshotting when i get around to expanding this; nerve system is supposed to feel a bit frustrating in that it's simulating fatigue, values/formulas could likely use tweaking though - i think rn it caps at 50% penalty regardless of nerves level for example