Wow, super interesting concept! Don't think I've ever played anything like this before. I think the best way I'd describe it is it's kind of like playing tug of war with yourself? Surprised at how addicting it was, and enjoyed the sfx and the clean minimalist art style. I also thought the music was nice and kind of catchy.
Would've liked a bit more explanation in the beginning as to what "balance" meant, but after a few rounds I started to pick it up a bit more. I liked how the perspective zoomed in and out to to make it clear if you needed a + or a -.
Nice work!