Mercy is an interesting game from a couple of decades past. Not entered in IFComp, it nevertheless managed to earn recognition, including a nomination for Best Story Xyzzy.
You play a euthanized at a hospital. The game is a linear thriller type game and has a branch and bottleneck structure which became the characteristic of Twine games many years later.
You wander around a relatively small map with a gloomy, moody atmosphere strongly reminiscent of Vespers, but less disgusting. Your goals begin to change around the halfway point, which is also where the game becomes more ambiguous and confusing.
I recommend this game for fans of a great story and/or atmosphere.