Table 4. The key responses of participants regarding the game characteristics and their perceptions during engagement with the game-based prototype.

Question domains	Positive feedback	Negative feedback
Game mechanics, rules, and interface	The storytelling game (Moving and Memorizing) was enjoyable, with its content, purpose, and display perfectly suited to personal preferences The Ocean Diver game was very enjoyable and well-designed, providing a refreshing experience	It is hard to judge how far to jump to grab animals or objects on time Sometimes in the game, the movements did not align with the actual actions The characters and objects displayed in the game were relatively small Sometimes, the game system froze
Game instructions	Instructions for the game were clear and easy to understand	No negative feedback
Gameplay experience	The exergame was very helpful as it promoted physical activity and memory The exergame could be played at any time, which perfectly fits the schedule There was a noticeable improvement in sleep quality	In the Ocean Diver game, some objects that needed to be collected were placed in tight spots, making it stressful when participants were unable to pick them up
Exercise dosage	The exercise was not too difficult, as it allowed me to keep up with the training	In the first week of training, the legs were quite fatigued; however, after the first week, it went away
Feedback for improvements	Overall, the games were satisfying, enhancing both enjoyment and physical activity	Making the movements in the game better match the user’s actions, increasing the size of the characters and objects, and reducing the game system’s freezing issues