What I mean with a consistent theme is if you have a gun and you're shooting the trash and the intention is to shoot it then maybe go in more on the concept of shooting it. Maybe hava a theme on the character or something that makes it so that the norm in the world is to shoot garbage. For example an aqua man with a piranha launcher that eats the trash. It can be something way simpler but just anything that builds to the concept. For your game you had a ghost that shoots trash. If it is important to the story then build a bit more on why it is a ghost shooting the garbage etc. :)