Really cute game. I don't know if it was intended but when i got stuck i just started clicking all stars i saw until something connected, which works a bit too well since it doesn't matter when you click extra stars that don't belong to the constellation. It would have been really nice, if the marked constellations showed up in the whole image of the sky, that way you could guess a bit in which area you still have to look for constellations.
Anyway the vibe of this game is really nice :)