I have been tricked into doing math! I feel so betrayed! I signed up for fun video games, not balancing equations!
Dialing back the drama a bit, even though math + stress = ??!?!? for me, I was still kinda charmed by your game. It feels a little bit more like Math Blaster than a game I'd pick up for myself right now, but a little time spent on the presentation and affordances might just clear that right up.
That said, just because it didn't rub up against my personal biases, I won't dismiss that feeling like an edutainment game isn't necessarily a bad thing. There's a reason people like me remember things like Math Blaster or the Jumpstart series, and if that's the direction you want to go then I think you're off to a good start.