It's a very cool game. I loved the coziness and the mechanics. I saw your comments in-game about the issue with how the colors can look different because of the lighting, and this is so true. I think that this is the most critical issue in the game.
The mechanic of freezing the crystals and then releasing them is so satisfying, but it is frustrating not to be able to identify the correct colors properly, especially the blueish colors, fix this and you will have a strong potential for this game.
You could try having one 3D model for each crystal beside the color. That would not only fix the issue with the colors but also make the game playable for people with color blindness.