It's a solid base, but not very interesting currently. I feel the timer is is too long currently, and there's no penalty for getting the answer wrong. It might be more interesting/challenging if the timer was short and answering right increases the time and wrong decreases the time. The game also doesn't end when the time's up.
Due to the lack of penalty, it's possible to just choose one answer over and over and get a higher score than just playing normal. Definitely an edge case, but I was able to crash the game doing this as well.