hint 1: >!the research was on the dev's part!<

i remember markiplier playing it. it was about being stuck in a very small room with little contact to the outside world. i remember that you got letters and that even though it was pretty short, it had a shockingly deep plot. i also recall reading that it was more or less a sequel to some other game. something Money. the game i'm looking for also had a two-word title.