I agree with you when you said that the characters don‘t really want to kill you, but if they see you with artifacts or Albert‘s parts they want to kill you, because those things have something to do with the secrets they want to keep. But I don‘t think Albert is going to be the true main antagonist, because it more seems like Albert wants you to find out the secrets on your own. Maybe Albert couldn’t really explain everything to you, because he just had a short amount of time to speak to you. I think Albert is the strongest human soul, reborn as a ghost-bear-hybrid thing and he wants you to help the other children’s souls, which would explain why Albert calls you „the last hope“.