I'm an absolute fan of the visuals which I think work really well in sending the message about rubbish piling up! It's not only a great message, but also a good UX choice.
The variety of rubbish in the game is impressive and adds a whole level of depth to the game too! Though I did sometimes find myself forgetting the control scheme so an in-game UI to remind me would go a long way.
There is a lot of depth and content for a game produced in 72 hours, great job!