R.E.M. is a hospital themed puzzle game built around the mechanic of a dream state and togglable doors. It reveals story elements through gameplay hints and eastereggs.
Use WASD or the arrow keys to move, press e to interact with things, such as doors, beds, or clipboards. Press q to wake up, and when there is text on the screen, press enter to read more/get rid of the text.
Download the .zip file and extract the folder inside. Double click on the executable and begin the game.