Allow me to kickoff with Greening the Planet.
You start with a very bare planet. You will then collect yellow energy pixels falling from the sky. This will serve as your currency to purchase and upgrade items or make your planet greener.
To collect more energy, you need to buy a weapon (laser for me) and aim for the meteors.
Watchout for meteor shower. Blasting these rocks could get messy but sure is fun! I have been playing collectively 5-6hrs with Level 9 Missile, 3 collectors and my planet is roughly 85% green already.
Apparently, when your planet is fully greened, a cute pink flower will appear. Should've known I have to leave the planet to care for another one. I was quite sad to go.
Check out the library for meteor samples and their equivalent energy points.
My favorite would have to be the Gravity Stone Red because it looks so pretty 😍