It looks like the current system for rotation implemented in this mod is 90° counter-clockwise -- which actually isn't an issue for any of the other shapes, since they're symmetrical both horizontally and vertically, but pentagons are unique in that they're the only polygon in this mod that has an order of 90° rotational symmetry that is >2.

In practice, this means that pentagons can only be rotated left, but not right, and can only be oriented up, but not down.

If it's not too much trouble, could we get all four pentagonal rotations added to this mod? :D