Pretty nice game!! I enjoyed it a lot. I love maths, in fact. Good job. Congratulations
I got the source code and compiled it in Linux. I had to change a copule of things (in case you are interested):
#include <cfloat> (for the FLT_EPSILON definition)
#include <cmath>(for the std::isnan() function)
and use a #ifdef _WIN32 to include the WinMain function and a standard int main() if in __linux__