Being created in collaboration with a Game Developer known only as shido, the upcoming promises to enable the player to explore a gorgeous submerged city and fish in its canals, with the work-in-progress demo providing a glimpse into one of the game's environments and demonstrating a massive fish swimming in the water.
Currently, the game is in its initial stages of development, and there isn't much information available about it. We strongly encourage you to visit the author's Twitter page to stay updated on any future developments and announcements.