Very creative idea and a brilliant fit for the theme! To approach the theme with a game where literally 'less is more' is brilliant haha.
I enjoyed the maths puzzles, I think maybe I could have done without time running out during an attempt though? Sometimes I was just trying to figure out what was being asked before I could answer and time ran out. Maybe this could be modified so that you get more points the faster you answer and there's no time limit for answering a question? So the points you earn go down the longer you take which still makes people hurry and panic, without essentially saying 'you lose'.
Honestly though a brilliant idea and the tune is going to be stuck in my head for quite a while lol. Interesting art style too to have the game actually take place within a maths book, you're clearly a very creative person! Nice work :)