Really fun concept! Actually being able to freely drag the boxes is a pretty cool idea, wish I could actually see them though, I guess that's the catch. I feel like the game could be improved if it was grid-based, as there's a couple of exploits that I figured out quite quickly, like placing a box directly into your character to make them clip through stuff. 

Really fun idea, would love to see you try your hand at polishing it up more.