Neat game, though the physics do make it pretty rough to play sometimes (you might already have it, but rapier physics 2D is a plugin that might make it work a bit smoother), the results of any given idea are inconsistent, for example on the first level with the circles I stacked all of them on top of the square and it fell over, leading me to try several more times just to realize that that solution works, it just didn't work that time for some reason. Regardless, still a cool concept, with more polish and more stable physics it'd be really cool to see a full version!