Interesting math game, but at the end of the day you're just trying to find a number that is 1 away from one of the rightmost numbers, right?
I think that this could be improved a bit if there was some more interesting decisions. At first, I thought that "11" would count as 2 1s, so I thought I should be trying for that, but it didn't. I also thought that the numbers were sliding down from the left, which would have made me plan a bit more, but again, that wasn't the case. With a few tweaks, this could be pretty cool!