Nice concept. I also thought of making a puzzle game , but didn't thought of this. Good Job!!!
One thing you can add if you decide to develop it further, is to keep the previous position of the size multiplier after player fails and restart, so he can iterate on top of that. And right now the puzzles are slightly straight forward, and I know its hard to make puzzles. So one thing you can do is let the player make a wrong assumption about solution being something, while in reality you solve it some other way, and when they finally found the solution they will feel clever, and that's what puzzle game want the player to feel.