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I love bridge building games. I have yet to find one that properly balances a good challenge and detail of strain with the freedom and ease of use of a video game. The closest was probably Bridge Construction Set. Poly Bridge is in that same vein, but also knows that sometimes you are just building something that will launch a car spectacularly.
There’s nothing wrong with Poly Bridge, and it is probably fun enough to pick up at some point. But it doesn’t seem to have the depth of Bridge Construction Set and errs on the side of a consistent and simple visual style (which I can’t blame).