How is your game related to the Theme and Special Object?
You advertise a burger restaurant to pedestrians walking through the area. If you hit them enough times, they will be influenced to buy a burger, and can get others to purchase one if they come into proximity after their purchase.

In short, you operate a turret, which fires annoying ads at the pedestrians. They will express their annoyance as you hit them initially, running away faster and expressing sadness/ anger