The game "components" that I've managed to create using JBox2D is the helicopter, a rope, the landscape, water, the tanker and the rocks thrown from the volcano.
Here's a video of a few of them combined.
They are all basic polygons at the moment (with the exception of the water), but it shouldn't be too difficult to replace them with proper graphics once everything has come together.
At the back of my mind is what new aspects I can add to the gameplay. I was thinking of something like, the player can (must?) transport crates to the islanders or the tanker to keep them supplied, whilst also defending them against rocket attacks. And, unlike the original, maybe the player can actually help the islanders escape from Krakatoa?