The quiz is simple and to the point, with no cruft, so the overall experience is pretty good. But I have a (slightly tangential) UX/design question: if now you are compelled to remove the Next button from the question pages, how would you achieve it, without reduction of functionality? For example, on the first question, which is a single-choice question, if you make it submit on-click, then the user would lose the a…
Fewer clicks or taps always win, especially in the single radio button option scenarios. Visitors seem to appreciate that kind of seamless help as long as they can go back and forth if needed.
One simple approach for multiple-answer questions is to branch the additional resulting questions into the same queue to generate more than one scenario. There is a fair bit of tech out there to handle such decision making pretty easily.