"Scientist vs Aliens" Game

A scientist named Jim loved to stay in his observatory and study the starry sky at night. Except that on one such night he noticed, quite by accident, that one of the stars was somewhat unusual (large) in size. He had to invent a new device in the game Scientist vs Aliens, with which he began to send signals to this star. The aliens decided that they were being summoned from Earth and came. Only these are very aggressive aliens - they wanted to destroy the scientist, who had no choice but to take up arms and fight them back. Help him in this difficult matter. He will be able to shoot the alien only when you put in a row of several identical objects. They will disappear and the scientist will shoot. Don't leave him alone with the trouble.

Match bricks with the same color by dragging them to shoot aliens.