UFO Defense

Earth is under attack by aliens. They are bicolour and only weapons of the right colour can destroy them. Shoot by arrows and hit the right colour. When you shoot alien with the wrong colour it grows and becomes stronger and worse killable. Enemies walk in waves and you have to defend Earth. There is more and more attackers in every wave. At the end you have to destroy the mother ship, which aliens come from. Be quick and make no mistakes. Save our planet. Have fun.