An exciting balls swap action game

The First Rule: It's better to try it once than to read about it ten times !
The goal of the game is to swap two nearby balls to make the straight
line of 3 or more balls. This lines will disappear and existing balls
with the new ones will fall down from the top. For each eliminated ball
you will recieve a score that depends on current "Intensity" level. The
"Intensity" is increased by each elimination but it is falling every
second. The "Intensity" changes depend of current game level, but the
faster you perform eliminations the higher current "Intensity" level
will be. While eliminating balls the "Game Progress" increases, when it
reachs maximal value you will be switched to the next game level. Don't
wait for a long time ! Lamps at the right bottom corner of the screen
will be lighten one by one. If the last red lamp is lighten you will hear
a "dong" sound, this means that if you will wait a little more the game
will be over. But each successfull balls elimination will turn out the
lamps.