Hello, i just bought you're game and i love it ! It feels like the older one but better. I suggest to make an option to have more dynamic small debris (or particle effect i am not sure) because they move at like 10 fps while the other stuff move normally, making it a bit weird. And also maybe a mode where you can destroy the map with a excavator / wrecking ball.
Aside from that, i really like how the physics is and you are probably the only game that as such realistic buildings physic :)