At first i thought this game could easily be given to a pupil who is learning how addition, subtraction and multiplication work. The grid movement makes the game at some levels much more complex than simple arithmetic. At some point i had to think for a long time about how to solve the level. The display below will even help you if you have calculated wrong in your head.
The games concept fits the theme of the jam very well. And i really like the overall presentation of your game.
Really good submission. Great work.