Canonically Corvo doesn't kill anyone iirc, low chaos is the canon ending because dishonored 2 exists, and to get low chaos, you have to spare at least some of the targets
Edit: just looked into it, and found a steam thread that details the canon events https://steamcommunity.com/sharedfiles/filedetails/?id=1350572458
I know I played dishonored but I remember literally zero from it
Story was weird. Got to Merc some nobles and become a god basically
Canonically Corvo doesn't kill anyone iirc, low chaos is the canon ending because dishonored 2 exists, and to get low chaos, you have to spare at least some of the targets
Edit: just looked into it, and found a steam thread that details the canon events https://steamcommunity.com/sharedfiles/filedetails/?id=1350572458