Turns out he has A LOT more he wants to animate and doesn't intend to reuse much from his previous works.
Latest month-end blog post shows off the work he's done animating Botan's rear, what with the myriad variations of outfits and accessories she can wear in this game. He even jokes how he's content to hammer out these variations at the expense of the bigger picture, so while he's having his fun progress towards actually finishing the development won't proceed much, if at all.
That said, I'm not going to criticise him if it means the end product has more polish than just about every other RPG in the DLsite catalogue.