That sounds cool, I remember when I played sakura clicker I thought "normal computers can't hold numbers this large, they must be using a bignum library" because the numbers go above what even a 64bit float can hold. There are c/c++ libraries and java/c# have it built in. There is even a way to make them in script languages that do not have them you have to implement it in a way that is complicated to explain, using functions. I remember that the multiplication technique was called russian peasant multiplication it is actually pretty cool. Anyway I never made a game on the concept but I remember how seeing ever growing absurdly high numbers felt. Anyway, I will be your team mate if you want, I can do mspaint and simple pixel graphics, and I can do some basic godot / gamemaker / unity scripting.