great idea
but i think it hasn't been done too much before because it takes alot of thought. it was ok at first... but its not too realistic. add some wind resistance, or something. i was on a level it was a tall taaaalllll tower, i exploded the roof, and a piece flew off and fell sort of a right-down. you'd think it would fall untill it hit the ground and bounce off. anything would, hell a bowling ball would do something. it his vertically and didn't move an inch. its like it hit flypaper of glue. it just froze. thats just one example, it can be a fantastic game, right now its just ok.