The art looks like its from ががめ on Twitter/pixiv, as well as the characters. I know they are making a game based off the ghost girl from an animation they made a while back, and it's still in active development, so I don't really know what this is or if this was even uploaded by the creator themselves. There's no mention of an itch.io upload on their Twitter or FANBOX as far as I can see anyway. Really not sure if this is legitimate or not.