I made an infinite runner recently to try out Phaser.js, and I let me wife try it. She loves infinite runners, plays them all day. Her comment? "I hate it." Why

I made an infinite runner recently to try out Phaser.js, and I let me wife try it. She loves infinite runners, plays them all day. Her comment? "I hate it." Why do you hate it? "I don't know." Well try to find one thing you don't like and tell me that. "It's too hard." What's hard about it? "I don't know." If I made the player jump father when you tap the screen, would that help? "I don't know." What about if you got more coins as you went along? "I don't know." I showed it to a group of kids in the family, and they went nuts for it. And their feedback was much more useful! After I saw how they played it and heard their complaints and tips to each other, I changed it up and presented it to my wife again and she loved it. Still couldn't quantify why though.