This was so much fun to play, hated it first because some collisions didn't make any sense, but when you're quick enough you get the hang of it quite fast.
Art is really good, but gameplay definitely needs a fast forward button, when you get to the answer, you just want to go fast xD.
Ex Level was the best one, your oc makes a good work on making the gameplay more interesting, don't know why he/she allergic to kappas tho (?