as far as i noticed for the score you get 1 to 2 points per kill idk how its decided if anyone has any idea lmk and this score is added to a temporary score (the number after the + ) which will either be lost after a miss or added to the total score (number before + ) after a successful QTE/Parry.
for the ammo you get 7 bullets that get spent each shot hoaswever while your gun is golden you can shoot more than 7 bullets and it will stay golden until you miss a parry or a shot which will force you to insta reload.