Committing my changes. They include:
 - a primitive (wings) that is being used as a flying object
 - 2 camera views can be selected/switched by "1" and "2" keyboard
buttons
 - "Main Menu", "Game Over", "Level Completed" windows
 - Time and Health are also monitored and shown during the Game
 - new tunnel with textures, effects and lights
 - several objects (Diamonds) in the hall-way that have different roles
(take Health, recharge Health, increase moving speed, give additional
playing time and final Level point)
  - added two secret Cubes/chambers where Diamonds for increasing speed
and time are located
 - appropriate/corresponding information gets displayed each time a
Diamond is collected