I came up with this will riding a really packed bus home from uni the other day.
Imagine a 2D side scrolling game where you play as a busy bus driver trying to cram as many passengers into your bus while also being on an extremely tight schedule. The aim of this game is fill up your bus and get your passenger to their destinations as fast as possible. There will of course be obstacles in your way such as roadworks, pedestrians, oncoming traffic and much more! While speed is one of your top properties, going too fast and crashing into stuff will rag doll your passengers and hilariously dismember them Happy Wheels style ;). When passengers get off at their stop all mangled and broken because of all the crazy driving moves you had to pull they will rate you on your awesome driving skills! At the end of the day you will be rated on your overall performance and how many passengers you managed to get killed.