well, the prompt usage is accurate but, the use of is not very fun. When making a quiz game you need a feedback that motives the player to continue answering correctly, this game has only the necessary feedback to play the quiz game. About the questions, well, it is like, you answer it via a google search, so, you need a contextualization of the question for the player to answer; because if it only stay on showing answers and a question, then it feels like an test, and the test has no reward more than a high-score so, i don't know, that's not very fun for me.
The music is very relaxing, a nice choice. The graphics look like the basic theme of unity UI, so, i will only say that the layout is intuitive, i didn't get lost.
Overall, a quiz test that i hope you learnt from it. In any case, you could take an example from Majotori, that is a quiz test as well but with a contextualization and great feedback.