First I really appreciate this game. I love seeing educational games. I love the game Witch Math. It is a math game like this, but it has a series of levels depicted as potions. Each potion has a value and making the potion gets you money you can spend on cosmetics. Harder levels give more money and the cosmetics get expensive. The cosmetics are extrinsic motivation. The harder levels are intrinsic motivation. I know it is not fair to compare your game to Witch Math. It is like comparing a movie to a short film. You have different goals. I made a game called Sevens And Nines. You have to multiply numbers by seven and nine. If you do it with a time limit you get hats. If you beat all three levels with or without the time limit you get to see Ai Astin's boobs. The boobs are the extrinsic motivation and the hats are the intrinsic motivation. As much as I am motivated by boobs I am not saying your game needs boobs perse, but it does need an extrinsic motivation. As someone who likes math, as someone who makes educational games I think this misses the mark. It is a good game, but I have no extrinsic reason to play it.
The music is grating. I don't know how you tested this game but I am going to assume it was without that song. The game is impressive in some aspects. Getting the blackboard to show the questions and answers. I think I know how you did it. I know how I would do it. I have not seen anyone do that in Renpy. I don't know how you prevented letters from being typed. The game is coded very well. +A for effort. B for game design.
I found a video explaning intrinsic and extrinsic motivation. better than I can.









































