I like the concept of having a 2p game where each person can see important parts of the terrain while the other can't, that could lend itself to some cool platforming ideas. The movement here could use some work and the level design too. I also didn't really get the left click to move boxes thing, sometimes it didn't work?
Keep working on it though! The theme was met and the concept is good and lends to some neat platforming situations between two players.