oh, I thought of another. When the player answers incorrectly, the screen says “you lost”. This felt a little negative and unrewarding. I was doing really well, my score was over 30 before I got one wrong. I felt like I did a good job but then I was greater with a negative response. Perhaps a message like “Opps, Game Over. Your score is 30”. Or even better, have the messaging be based on score. If the user scores under 10: “You can do better, try again”. If score is between 11-20: “Not bad”. Above 20: “Wow, great job”. And so on.