So it's been nearly a year since the last demo version, but the dev put out a new version of the demo the other day. There's really not much to write home about, though. The first couple of areas in stage 2 are playable now, with two new enemies: a sort of bird fly, and a crocogator. The fly has a new game over CG, but the crocogator doesn't, even though I've seen one on their fanbox that will probably be correlated to it down the line. Just careful cause if the croc catches you while naked, it'll drag you down into the water and eat you, leading into an instant KO.
Some other minor stuff was added. Certain NPCs now have "talk" or "mission" above their heads. The latter leading to the key gems that weren't too obvious to get. Your special attack now has a meter that you deplete when using it. Enemies now drop small orbs that will either restore a small amount of health or the SP meter. The evil bat boss now is more obvious to when she's vulnerable to attacks, or shielded.
If you do beat her, careful, cause there's no separate save files to use. I think it does that thing where it saves in an entirely different folder than the game. You won't be able to go back and fight the boss, or even go to the first level. You'll be stuck in stage 2 until you start a new game.
It's a bit underwhelming that so little was added in the span of a year. I've seen plenty of stuff for the game from them on their fanbox. So maybe they're just getting all the assets done before putting them all in the game.