This game is delightful! The art is beautiful, most of the puzzles are bizarre, but not too difficult.
Unfortunately, I am stuck on just one ingredient: stardust. I have viewed, grabbed, and tried to speak to everything on both sides of the room. I have only three things left in my inventory: the broken crystal ball, flame (for the second time), and love philtre (for the second time), and I haven't managed to get any of those to work on anything. There are four constellations in the sky, and I cannot interact with them in any way.
I can't tell if I'm missing something obvious, or if there's a bug. May I have a hint?