National Warden: My Prison Can Be Upgraded Infinitely

As soon as you open your eyes, the whole world travels to a gamified prison survival path. Start with a palm-sized territory and build your own prison. Receive prisoners to get funds, and the prisoners can get funds after surviving for one night, and operate the entire prison reasonably to survive. The territory is surrounded by black fog, and zombies appear at night. If you don't want to be the next zombie, please upgrade your prison, build stronger defenses, and recruit more prison guards. If the prison is breached, the death of the prisoners will wipe out all lives including the warden.