Khimera: Puzzle Island version 1.6

Version 1.6 coming at you with a few minor fixes. Depending on your system, it may fix any fps issues you've been having.

Version 1.6 - April 11, 2021

• Fixed timing issue causing the game to lock at 50 fps on some systems.
  
• Fixed typo in credits.
  
• Added functionality to enable/disable an FPS counter with F4.