I just added the forest level to the game.

You can enter it after finishing the desert level, once the desert is complete you will be able to choose the forest from the menu screen.

Added some music and sound to the level. 

Also did check the desert level.

There will be still more level to come.

Have fun! 

Let me know if you find any bug!  :-)

Linux people, please let me know if it is working!  :-)