I guess you didn't read the KS post carefully enough. Studio Chiffon mentioned Everium is another studio, totally not relate to the them. And this is Everium's version of Softly with Teeth. Beside the character name, vampire and Halloween party concept, it's obvious that everything get build up from scratch. This is not the original "Softly with Teeth" you knew from the KS and Studio Chiffon anymore.
And if you take a look on Everium itch io, you will notice that they already release a few short game, which have the same style as this. Everium style clearly different from Studio Chiffon.