Logic Block Puzzle

Hooha are creatures that look like squares. They are either red or green, as sometimes they can switch color. Hooha live on an unknown island. In their spare time, they love to play a game, in which they jump off high-rise and drop onto others that stay on the lower floors. Sometimes they get so angry and smash others but sometimes they are smashed. The goal of the game is to drop all to the bottom and make the colors of remaining Hooha as desired.
Help Hooha to win the game and have fun!