Added customizable crowd density in Survival Mode. Increased the upper limit for customizable zombie density in Survival Mode. Added a feature to delete save files when loading records. Tentacle zombies now appear in the Hard difficulty of Survival Mode. Increased the speed and range of auto-pickup. Fixed an issue where NPCs in Survival Mode would incorrectly call the protagonist "Jack." Fixed a bug where the girlfriend's backpack would suddenly disappear. Adjusted the navigation for some quests. Modified the flow of certain side quests. Updated the rewards for some side quests.