Performance

Changed to stop enemy movement when the game is over or when the game is cleared.

Bug fixes

• Fixed an issue where the chainshotgun would not fire.
  
• Fixed an issue where the chainshotgun gauge would not display.
  
• Fixed an issue where plasmasmg bullets were increasing in size.
  
• Fixed an issue where enemies killed by non-player attacks would be counted in horde mode.
  
• Fixed an issue where walking enemies would spawn from the air in Horde mode.