This is a simple idea for an app, it is fun and superb for children, very informative. I would recommend to add more questions, and maybe at the end of each level you could add a “see answers” button, and maybe give a simple explanation on each answer on the “see answers” button.
You can also add difficulty modes, because that would even be helpful for a 18 year old like me.
Overall the game is fun and the questions you added are really good.
It was a great idea to put these fun games, like the soccer one, that distracts you from the questions scene. So you are having fun and learning at the se time.