I can though.
Some more news from the dev, but it doesn't look like there's any demo content yet.
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They've been working on making a basic undertale-style prologue animation for I assume the start of the game, begun work on some of the scenes for the other existing enemies with sprites for some nice variety not of the mating press kind, and has also done some sprites on the new enemy design and their gimmick, which is teleporting to block the player's forward progression. I feel like the enemies in this are slowly getting more and more stylised, I like the look of this one the most.
As for the paid plan bit, there are full body illustrations of some enemy drafts the dev may or may not use. I can't post them here because ci-en's payment processing has changed because of some morality spat with VISA on Dlsite. I don't know the full details and I honestly don't care to look into them.
Most importantly for most people still curious about this game, I don't believe a demo is included in the paid plan either so no new playable content yet. At least we know it's not abandoned just yet, I suppose.