The listing, Jack Is Missing (Steam Key) has ended.
https://store.steampowered.com/app/921500/Jack_Is_Missing/
About This Game
Ending explained
For those of you who were confused at the ending, Kevin was getting punished by his nightmare because of what he has done.
A One Room based first-person game
Jack had always thought Kevin was his best friend, until the day he was murdered by him. After the murder, Kevin felt hunted and that Jack's ghost was at the hotel to take revenge, but he assured himself that it was only his brain feeling guilty... Play as Kevin in this horror journey, who had just come back to the hotel after murdering Jack. You can also interact and examine objects, as well as make phone calls with the telephone in the hotel room.
Key Features
Interact With Objects: Full control of lights.
Examinable Objects: Read notes and examine objects.
Interactable computer
Interactable phone
Mature Content Description
The developers describe the content like this:
This Game may contain content not appropriate for all ages, or may not be appropriate for viewing at work: General Mature Content