Level 50: "The Bagged Apocalypse"
It's the end of the world as we know it. The skies are filled with the sound of bag flapping, and the once-clear waters are now a swirling mess of plastic. Welcome to Level 50, where the only thing that's still standing is the sheer amount of bags that we've accumulated.
Go back to Level 49 and see how we got here. Or, if you're feeling brave, proceed to Level 51, where the bags have become sentient and are now judging us. Or, if you're feeling particularly adventurous, go to Level 52, where the bags have become a sentient, giant, talking bag-beast that's determined to devour us all.