Fly in the space filled with diamonds and meteors. Just avoid and shoot with the right color. Simple principle to understand, hard to master.
As you fly diamonds start appearing ahead. They have various colors and you must switch on the right one if you want to destroy them and collect points. When you forget change it or you just fly into them you are destroyed. The meteors can be shot as well but it’s simpler to avoid them, sometimes. The game was made it Game Maker but looks great so have fun.