Small Update 2

Some new updates:

•  Coloured the player trails to help distinguish players a bit.
• Better game flow - game over now redirects to the main menu and it is easier to get around the game.
• Esc now quits a game back to the main menu, and quits the game from the main menu.
• The player has higher friction when walking on the ground to make it easier to enter turrets or automate them.
• Fixed some bugs with the UFO not displaying after a while, so the game can't be 'beaten'.