I really love the concept of that game, very juicy, sound is perfect. The reward system adds a very rich strategic system to the gameplay, it as so much potential! At first, I thought that I could use all my numbers and choosing the best calculus to do a big number of damages, but I only could choose two numbers and an operator (I hope I didn't miss some important gameplay part to make big numbers) ? Maybe a more stastifying idea is that you can use each operator once, to build the final number to damage the numboss. For example, when you cross an operator, you can stock the result on the square and the operator is disabled, so you can use another number with the other enabled operators. And if there is a Numboss with a special color, that means you have to finish with this operator. Of course, you can use only one operator with you don't stock the result and damage immediately. I really wanted to do that on your game XD (and I love your game so much, I am sure it can be a banger with some gameplay improves).