Endacopia is a surreal adventure with elements of psychological horror, where a desensitized child named Mellow tries to escape from a creepy house. At the very beginning of the main character's journey, a lizard-like monster in a sack named Henry is captured. Playing the role of a guardian angel, the player leads a disoriented character through sophisticated logical tests. The environment is stylized as educational computer programs of the 1990s, and the atmosphere is saturated with elements of body horror.