The physics need quite a bit of work, or at least the way the game views joints. Build a model bridge out of glue and balsa then stress test it, you'll see that it rarely breaks at the joint. In this game, joints fall apart as if they're held together with masking tape.
3/5. Great idea, but needs work.
The pizza boy's inability to multitask is incredibly annoying, as is the waiting for the customer to give a reaction. Props for the save feature, though, otherwise I wouldn't have the patience to go for the badges.