The concept of this game is great. I love the mechanics, but the only issue was that it was difficult to figure out the controls. Once I figured them out, it was fine. (Not sure if there were any controls that I missed) This game really has potential.
(I found the game through Reddit)
Edit: After looking at the game a little bit more, I can create new moons around the planet and advance to the next level, but not sure how either of those happen. As VOid1 Gaming mentioned below, a tutorial would be really helpful.