Rollout Rocks don't work properly in 2D mode.

So Rollout Rocks don't work in 2D. You can get on the rock just fine, but pressing the A or D key to move left or right doesn't work, and pressing W or S does make you move left or right, but at a snail's pace. However, you can still push the Rollout Rock left and right in 2D, and it'll move normally.