The first part of the optional way the player can go right now that I'm going to work on is a boss fight against the six members of the Security Seven that you have encountered at the beginning of the game, when they throw "you" off a cliff. After travelling all around Plan-X and finally coming back there, you'll have to fight the six of them at the same time, then triggering one of the game's endings. I'm not sure what the endings will do, maybe you'll need to complete them for a specific achievement?
Time spent on the project so far: 666 hours
Currently working on: An optional boss fight + ending