Great concept. I liked the randomness in the arsenal to keep it fresh, and there was a real feeling of satisfaction when I figured out how to cause destruction. There is of course room for improvement but it's just a matter of developing the pieces that are already there.
For me, it would be nice to have more flexibility in placing objects (different angles, flipping orientations, and more freedom in where to place things). Especially since the player is not a controlling a character, it can be difficult to make them feel like a participant in the gameplay. I think giving them more degrees of freedom in what they control would help to accomplish that.