[b]Bug fix[/b] 1. Fixed a bug where opening the pause interface caused the volume to be set to 0 2. Fixed a bug where some sound effects were not affected by volume settings 3. Added a simple flag for language selection on the title page 4. The announcement on the title interface supports multilingual versions [b]Adjustment[/b] 1. Flies can now experience falling 2. Balanced the zombie generation rate of the forest cemetery level We have reopened the demo entry on the Steam store page. The demo is a simplified version that only supports a few upgrade options, characters, and weapons, with slightly different clearance conditions.