Very fun concept but a little too easy. Its incredible for a jam game though.
If you ever plan to revisit the game or its concept in the future, it would be cool if you could add more ways to count such as division, exponents, square roots, etc.
Also a level where you need to manage multiple playable characters would be fun.
And a menu, its annoying not being able to store your progress anywhere.
Also what happened to the multiplication symbol at the end? There were only minus and plus symbols left...did multiplication die?
The lore should definitely be expanded if you make any kind of sequel.