Game Scientist vs Aliens online

Peter is a scientist astronomer. He had dreamed of his whole career with a meeting with extraterrestrials and once his dream came true. The flying saucer landed right on the roof of the institute, where the hero works. The guy ran to meet guests from a distant galaxy, but they were not disposed to communicate, but tried to attack. Help the botanist fight off, collecting three or more identical tiles in the ranks.