The concept for this game is really good! Only being able to turn around once made me stop and think about how I was going to complete the level before I touched the keyboard, and the game managed to be a puzzle platformer without needing to have the traditional puzzle platformer aspects like movable boxes and lasers. I did encounter some physics engine problems - one time when I walked across the left of the screen to wrap around, the box just fell off, and on the final level, when pressing up against the left purple wall in the top-right of the screen, the box was half inside the left wall.
I would love to see more levels of this game!