All 5 chapters of Critters for Sale will be available June 3rd 2021.
If you haven't already, you can play the first chapter here:
https://store.steampowered.com/app/1350240/Critters_for_Sale_SNAKE/
Note: If you have played the first chapter previously, there are some extra areas inside the club now, guarded by a difficult (but solvable) puzzle.
There is also a new trailer for the game, showcasing some new footage from the final chapter: