Game apparatus and program

A game apparatus that provides gameplay for development of one or more characters that evolve through a plurality of evolution stages, the game apparatus comprising:

• a sensor that acquires information about a state of activity of a wearer,
• wherein the sensor comprises an acceleration sensor that detects movement occurring in the game apparatus and/or a heart rate sensor that detects a heartbeat of the wearer;
• an update unit that updates a first parameter based on the information about the state of activity of the wearer acquired by the sensor and updates a second parameter based on updates to the first parameter at each timing of updating the first parameter,
• wherein the second parameter comprises a condition of a developing character of the one or more characters, which is determined based on a plurality of updates to the first parameter, the condition representing a mental state of the developing character at each timing of updating the first parameter;
• a display control unit that causes a display screen to display the developing character in a display mode corresponding to the first parameter and the second parameter, which are updated by the update unit,
• wherein the developing character is displayed based on the condition included in the second parameter;
• an accumulation unit that accumulates an evolution score relating to development of the developing character based on the first parameter and the second parameter, which are updated by the update unit,
• wherein the accumulation of the evolution score is corrected based on the condition included in the second parameter at each timing of updating the first parameter;
• and
• a determination unit that determines a target character of the developing character based on the evolution score accumulated by the accumulation unit.