I like the core game mechanic, and the level designs force you to interact in a natural way.  Trial-and-error can get boring after a while, but you've avoided this by ensuring that respawn points change as you progress.  There are a few bugs (like being able to jump off the side of the screen or background sprites showing in front of things) but it has the basis of a great game idea.  Good work.

I really like the implementation of the idea here, the execution is good although I would have liked to have seen more guidance in the earlier levels on what the player has to do, there is a lot of trail and error in your game which leaves the player to have to restart the game multiple times.  But still a really good idea well achieved.

Great idea and nice game play however there is a major issue with disappearing character if you exit the current area whilst in the box which results in not being able to complete the level