falling cubes

A very short video Game, only 5 level !
The cubes are falling!  If you stack three cubes (on showel or on floor) 
of the same color, all cubes of the same color will be enhanced 
and disappear.  
The player controls the cubes using the arrow keys.
the space bar allows you to drop the cubes 
the AltKeyGr allows you to shoot the cubes 
If 60% of the playing area is covered by cubes, 
you lose the game.  
Good luck.