1. A game device, comprising: a display unit for displaying a game screen including a game character having a part that moves a moving image moving within the game screen, and a trajectory image indicative of a reference trajectory that represents movement of the part of the game character; a designated position obtaining unit for obtaining a position within the game screen, the position being designated by a player; a first moving image control unit for moving the moving image from a given initial position toward a start point of the trajectory image indicative of the reference trajectory; a second moving image control unit, when the moving image reaches the start point of the reference trajectory represented as the trajectory image, for moving the moving image along the trajectory image indicative of the reference trajectory; a determination unit for determining whether the position obtained by the designated position obtaining unit is located within an area based on a position of the moving image during a period when the moving image is moving along the trajectory image indicative of the reference trajectory; and a game processing unit for carrying out a game process based on a result of determination made by the determination unit.