I liked the idea of explaining tutorial as I'm playing. I'm still confused of what the values mean but ok. Maybe you can add a menu with the tutorial in it and the reset level.
I don't know how did i win the first 2 levels. But in the third I couldn't make it.
In this level, when i shoot to box 1 wrong and go to box 2, i can't go back to box 1. I needed to reset until i was sure the calc was right.
Yet good game. Like the music. Could have sound in shooting or a sound saying that you are wrong / right in the box.