Fun idea. Needless to say, I could even see it turning into an educational game. I also like what you did with the art style.
Thanks! I really wanted to make more levels, but it is what it is, I had to scrap about 5 or 6 of them due to logical problems or the inability to have a y = (x-2) answer in my code (I hate strings why did I use them). Really glad you liked it!