This game aligns with the standard CCSS.Math.Content.4.MD.A.3-
Apply the area and perimeter formulas for rectangles in real world and mathematical problems. For example, find the width of a rectangular room given the area of the flooring and the length, by viewing the area formula as a multiplication equation with an unknown factor.
Great game for reinforcing the formulas for area and perimeter. It can also be used as a nice lead in to a discussion about how shapes with the same areas can have different perimeters and vice versa.