It's a brilliant Physics Game. Thankfully, I don't suck cos I'm a physics god.
But The Idea is Amazing! If you could add a few more elements, like different types of houses, perhaps a magnet house that can attract other houses but only when they are in the air., Or a levitation house that slows the y-fall of a house but not its x-velocity etc.
Overall, Its a game with a LOT of potential. Please do Work on it
:D