Doomsday - An on-chain, apocalyptic survival game

This is a project that I built over the last few months. I've written up a technical description of how it all works on Medium:
https://anallergytoanalogy.medium.com/the-doomsday-nft-adb113a986ec

The game plots Bunkers on a world map, all in real-world city locations. When the apocalypse begins, space debris will impact the earth, destroying bunkers until one remains, giving the winner an ETH prize. Atm it's up to 30 ETH, but it will continue to increase as more players join or reinforce their Bunkers.