Such a cool idea for a puzzle game! I love the way the boxes can move from one area to another. I really wish there was a bit more indication of what areas will affect the path it can slide on and what can't, like maybe the rail lights up a certain color same as the box. I found myself just tugging at the box in all sorts of directions not really understanding the consequences of the push and pull. This got especially tough in the rooms where the rails moved with the boxes. It didn't seem like there was a reliable way to get it to work.
Great game though! The messages and tutorial stuff was perfect. I really love the testing cube style thing thats here!