This is really nice, I like how you applied the limitation to a 3d game and used it more like the main mechanic. The level design is nice- I love that when you teach the player how shift works initially, they're given a platform below them in case they don't move. Difficulty felt a little inconsistent at times, but I think the puzzles were really nice overall. I think my only big piece of feedback is that the movement of the ball felt unexpected. My momentum seemed like it was reset whenever I landed, instead of it feeling like I was continuing to roll and keeping the momentum from when I jumped. Otherwise, very nice.