This game is great. As for the backstory, I'm thinking controversial, if not illegal, experiment, and only one other being survived, and you loved them deeply, and were horrified to find they had been turned into the same thing as you. So you decide to break out, kill anyone who stands in your way, eat the scientists as revenge for the pain inflicted upon you and your loved one, to reach them, only to end up being recaptured again and again, in an endless cycle as those who have been employed by the creators of the project, have nothing left to loose in life, no loved ones, no friends, nothing, making them forgettable and perfect for the job, even if they just end up dying in the end.