Thank you for all the great suggestions. Some of them I've considered: features that would reduce player difficulty. I'm constantly balancing the game's difficulty and playability. This is a small game, and I don't want players to be too easily beaten, thus losing the challenge. I'll listen to more player feedback and see if the difficulty needs to be reduced appropriately. Also, as I'm sure you can see, each level offers different ways to complete it. This encourages players to experiment, which is also a good strategy.
And, most importantly, when you hover your mouse over a planet, its name and quality will be displayed.
Thank you again for your support!