A great improvement over the last one. The levels gradually getting harder makes the game challenging but doesn't make it frustrating. This setup made it a lot more fun than the previous version. Still there's always room left for extension if you're up for it. The game's physics engine is really worth making more out of this game. I think it would be really cool to add a theme to it and made building the bridge a mission with a higher objective than a working bridge. I.e. a bridge with a specific goal. An example could be troops having to move over a river to reach their objective, or a checkpoint, but the bridge having been molested by some evil force.

Oh and the music was a nice improvement too.

Really like it just like the previous one. Only this one is more fun for me because there are more levels and it's easier at the beginning. Good improvement.