There is definitely no excuse as to why Soul Sacrifice should look as bad as it does. They seem to have improved it slightly in Delta but of course there's not a whole lot they could improve while using the same assets I suppose.Dunno, maybe by pursuing a more hectic gameplay they are chasing after more stable framerate performance and thus they must sacrifice other areas to achieve it such as graphical showcase?
Though perhaps I am talking out of my ass here, hahaha.
Can't really comment on Y's since it's not out here.
And yeah, it's hardly that much faster than Toukiden. It's not even running in native resolution.