Very creative. I personally would use a softer, less saturated, color palette. Great game, and really cool idea that the black tile just ruins your cube and the white tile resets the cube, just like real life paint.
But… I think the limitation was a bit vague interpreted. It’s OK, because it’s still a great game.
On the flip side, it’s great that the game needs zero tutorial and it’s very easy to get into. Also props to going isometric, not unnecessarily going 3D, and choosing Godot!