Fixed the following bugs:

• Oneliners showing one after another after the first kill.
• Mouse not appearing at end/exit of level.
• No transition animation at start and end of level.
• Corrected spelling of "Difficulty" in optionsmenu.

Added the following features:

• Enemy death effect is now visible outside of vision cone.
• Added animation when quiting the game.
• You can now press R to restart the level at any time.
• The last enemy will now move towards the player position, since it can otherwise take ages to find him.