Neat!
I like how you make your own constellations by connecting different stars, although I wish there was a little bit more of a difference between them. Colourblindness doesn't help with distinguishing them, because of that it would also be nice to have an undo button since I would see the table at the bottom count up a star I did not mean to get.
Aside from that, it really reminds me of Potion Craft, the way customers come to you for specific wares.