Update Notes v1.1

- Difficulty tweaks:
     - Reduced all enemies spawn interval
     - Slightly increased archers and knights' first wave delay
     - Increased range of spawned knights per wave (1-2 => 1-3)
     - Doubled arrows' speed
     - Increased knights' resistance (+66%)
     - Added a (very short) cooldown between two weapon swings (0.16 sec.)

- Fixed player's death animation being cancelled under certain circumstances

- Fixed blood refilling after death if the player walked into a puddle right before dying

- Fixed music switching when the game window was out of focus