I just thought of something, and apologies if this has been brought up earlier
There are a few elements i've seen of this game that really make me hope that the bonus playthrough (assuming there is one, and we know there will be) is Contra-style
Obviously, Albus wields a gun, and as one part in the video showed, it's a gun that certainly packs a kick
So why not have a one-hit-and-you're-dead Contra style bonus playthrough? Instead of Glyphs, he could absorb different gun powerups from enemies
We obviously don't know where the story will go, but it's a thought, and I like to think, a pretty good one