The idea is good but I'd recommend using the svg that we have for continents already. You should probably use the svg on Quizzer6794's 7 continents map quiz to make the map more accurate.
I thought about it, but I felt like using the Mercator projection made it better for clicking. The only difference there (that I'm aware of) that I'd consider adopting is the Europe/Asia divide in Russia, which I didn't include because I was lazy.