Sweet little puzzler. The controls felt a bit sluggish to me, though that might be because of the way the physics interact with the physics. The ability to manipulate the game world (sliding the panel, destroying boxes) should def. be communicated in some way.
Otherwise the physic interactions were a really nice touch that made the whole thing feel alive. And as someone who still struggles with 3D in Unity I'm super impressed at the level of quality you achieved in only 48h.