The main character could be appealing as a sort of Starlord from Guardians of the Galaxy type, but the writing would have to be actually good to make his pop culture attitude actually funny and not annoying. Fighting alongside a dragon, not sure if it's actually working out all that well in this video. Combat seems like a lesser version of Dragon's Dogma - being an RPG adaptation of DMC basically.
Does it have cities? The game seems like a big open world, maybe. Seems Kamiya was basically trying to make his version of Dragon's Dogma, and try to use his DMC roots for an RPG. That sounds cool, but it didn't seem to work for me.
Gameplay can always be improved. I think the big thing this game never sold successfully to people is the actual setting, the main character, the cohesiveness of the art style. Maybe it's all there, and just wasn't shown - but we'll never know. It looks a bit like a lazy mashing of DMC into fantasy that really clashes in an unappealing way.
Ironically, I don't really think it's that different from DMC V honestly, or even Dragon's Dogma. Similar looking main characters. V looks like he might play similarly to the dragon in some ways. Capcom and Kamiya kind of went in similar directions. If Scalebound was worth salvaging, it would have to be better or at least on par with both those games. You even mount the enemies like Dragon's Dogma. I guess it does look pretty fun honestly lol, just was never finished.