After the 12th level, the stages quickly begin to pick up in difficulty. Before that point it's sort of easy. It gets really frustrating >_<;
In spite of my apparent skill issue, it's still a great game to pick up and play. The bridge physics definitely have weight to it. And the player feedback of having certain parts of the bridge flash and "stress" when the design is slightly faulty is fantastic.
Also, the concept is funny. I explained it to my mom and she told me it was like a fever dream.
Good game! :-)