Which itself was probably inspired by "Schlag den Henssler" [1] a German game show where they had a brief minigame revolving around splitting things precisely in half.
So personal thoughts - it's very polished and IMHO definitely a bit more enjoyable on a device with a touch interface. I think the trickiest element is going to be gamifying it a bit more; it feels a tad clinical for lack of a better word right now. It could be worth looking at games like Fruit Ninja for inspiration on how to "gamify" the experience further as well.
One area for improvement might be adding a stronger thematic framing for why you’re dividing the objects (like virtual splitting a restaurant check among friends, or cutting up a pie, etc).
You might also consider introducing cuts into perfect thirds etc as a way to sorta ratchet up the difficulty.
I really like the idea of thirds as well. or maybe require different percentages, not only 50% or 33%, can be random to add more into difficulty.
Thanks a lot