■ New Atmosphere
• Stage 1: thin ground fog across the entire map, drifting toward the player
• Monster spawn smoke now rises ahead of you along the rail route; density toned down
• Loading screen now shows real loading progress

■ Stage 3 Defense Rework
• 7-wave structure with boss phases and a final boss rush
• New HUD for wave progress and remaining monsters
• Improved spawn placement and respawn pacing

■ Fixes & Stability
• Fixed errors when restarting or re-entering a stage
• Game over now properly stops combat and returns to the title screen
• Fixed the Stage 2 escape sequence triggering multiple times
• Master volume tuned to 70%; reduced BGM memory usage
• Optimized default graphics settings for more stable framerates