Thanks for playing! I've noticed that "bug" on rare occasions. The coding/design has a collider on each color face and of course the penguin also has a collider. Depending on what color you hit I either allow the move or prevent it. However if you move at just the right time while a shape is turning you have the possibility of contacting two colors. If this is done quick enough the "bad color" flag which is triggered will then get flipped back to the "good color" flag on the second color hit this allowing the move. With more time I could tweak placement of the colliders and or doing something in code to detect and prevent this. I mostly prevented this my holding back your movement while the shape is moving but the timers aren't quite in sync allowing for a bit of early movement.
Considering those with color blindness, the red and green might be hard (or impossible) to distinguish so I'd also consider something (maybe a "symbol" mode) which would turn on unique indicators on each square and make it easier for those individuals to figure out which squares could be moved to.