Ok, but...

The game is ok but crashes flash around level 37+ everytime for me: it's the first game on NG I've run into this with.

Fun and education...

... what more does a game need?
If you do as HorrorOfHell suggested and combine the parts it would be a bit funnier. and perhaps some animation for the monsters, but the rest was ok.

Class B

I liked it, the only problem is the Graphics are poor. But the Math thing was great.

Just like the "Muncher Games" from back in the day

There's not much difference here between the old "Number Muncher", "Math Muncher", "Word Muncher", etc games which used to be played on old school computers using the 5" floppy disks.

It's nice to see a tribute, but it's not original. The game itself isn't stolen or anything, it's just not all that interesting.

needs more!

I recommend you combine all these flashes into one and let the player choose addition, subtraction, division or multiplication. A cool idea would be to expand the field beyond the screen, as in it scrolls over as you move. Maybe add different colors onto the text of some problems which designates a powerup if that problem matches the equation.
It would also be nice to eventually see a version that features all the mathematical signs on the screen, not just one at a time.