The game is simple in concept, but it reveals the theme of game jam. I also liked that there are no bugs in the game (or I didn't notice)
However, the game lacks dynamics in the gameplay, the bridge and the boat are very slow. I also don't like the idea of a timer, it would be better if the game ended when a large queue of people or boats was reached. (correct me if i'm wrong)
Its not bad game, considering that you spent 4 hours on it, especially if you are a beginner. I think, your game has a future, especially on the Mobile platform :)