The Backrooms Deluxe will be delisted from the Steam store on December 24th, in favor of the new game (The Backrooms Deluxe 2). If you bought any DLC or added this game to your library before it will be delisted, you will not lose it. All current owners of The Backrooms Deluxe will keep the game in their library.
Originally, I wanted to just delist the game from search, as has been done for many other games, but I wasn't able to get Steam to allow that so my next best option is to delist the game.
At some point, I will provide a build for the game in my Discord server that is entirely delinked from Steam and can be played on LAN.
If you don't have the game in your library yet, you may add it for free if you wish to keep it after December 24th.