I like the fact that the game has a tutorial and a real sense of progression to it at the start. I think this is a really, really strong entry even if it isn't too intertwined with the theme. The art and sound design feel really cohesive and overall this feels really fleshed out. I think this is my first 5 start rating.
That being said, I would have liked more info on figuring out what to feed the planets. I eventually realized that hovering over the side bar gives a description of likes and dislikes, but I spent a good 10mins just trying to figure out what was what. I think if you were to start with like the minimum info on screen and build up to the full list of food and what not it might be a bit more user friendly. Also if you maybe have some like shortcut of food preferences when you hover over a planet.