I love the sound, it's sooo soothing! Perfect for a puzzle game like this. The concept is also simple to understand but leads to a lot of complex puzzles, which is perfect when setting up a good pace :)
It's pretty hard though! Or maybe I just need to brush up on my puzzle skills :) Also, I'd like it if you put more emphasis on this part of the instructions ingame: "In the stars with a black circle, number indicates size of the constellation that star is in." If you didn't read that, you wouldn't ever get the 2nd level.
Overall, it's pretty good! I can see this doing well in other markets :)