According to Wikipedia, “Angst is a Dutch, German, and Scandinavian word for fear or anxiety. It is used in English to describe an intense feeling of emotional strife“
“Angst is caused when a person makes a decision that has unpleasant consequences and leaves that person feeling guilty and remorseful“
Angst can be a more emotional reaction to a difficult and meaningful choice. Creating angst in players, is a sign that you have achieved a good emotional range, immersion and that you are offering meaningful choices.
Too much angst might lead to frustration, may not be what you player’s want from the game.