Yes, exactly this! Some cool animation, maybe some sound effect when the right answer is selected and another one for the wrong answer. Little things that may create some excitement to the players and make it more attractive to play. Specially when is meant to be played by children.
Also if it is possible to select and add a colored background to each question form
Also It may be more practical ( in control panel) to unify main and extra tab and put the image selection in the same page above the questions input fields to avoid mistakes and to avoid extra clicks to check if the image is added , or if it is the right one .
Still is a perfect plugin .No need to worry at all.