https://www.youtube.com/watch?v=OhuNoZtxxws

Things are starting to take shape, but I believe I'm going to have a hard time teaching how all the systems work together. The idea is that you have to keep close to the drill that gives you passive income as long as you keep it running with energy. You also need to stay inside the drilling safe zone to not take environmental damage. Once the drill hits a pocket, the safe zone will momentarily grow and you can pickup a lot of loot that would be hard to get to otherwise.

The other part is an upgrade system (not implemented yet). Every time you hit a threshold of cash, you'll be given an upgrade that helps you. If you survive long enough you'll need to take down a boss.