This was a fun math game! It was simple but still, the idea is good.
One problem I found is that there's a puzzle you always get to that is 1% 0 and you can actually lose when the equation is simply undefined and doesn't equal anything. Also, something kind of weird happened to me: after by luck I passed the 1 % 0 question, I for some reason spawned in game as if it was a 3D first person game... Like, is this a deliberate choice??? Cause if it is, it'd be a pretty weird one lol, and I don't know what to say about it. And if it's a bug, I can't fathom what could cause it! This is what I mean:
Adding a time could be good to, or giving you more points the less time you take to answer. Things like that would really spice things up!
Congrats on the submission!