I'm going to be blunt.
The art-style is ugly. So Ugly its permanently stuck in my mind in a good way. You've captured the essence of an old school western of High Plains Drifter, and by god I wouldn't mind seeing this fleshed out further and made into a full production film.
I gave this a ten because of story value alone. I've seen this before, a ghost out for vengeance, but the twist at the end flattened me. The way you incorporated the music from some of my favorite westerns is perfect.
The only improvement is your art, and with practice, thats only an inevitability. Keep it up.