This is a creative idea! I like how the prototype looks--the shadows have a charming visual style to them. The story of mixing potions to affect these shadows to try to help them is pretty interesting! Of course this isn't a full game right now, but it's an interesting idea. The speech bubble is a good way of interacting with the shadows so that's another good thing to keep, and recoloring the shadows after applying an effect on them is good too. Only other feedback I have is that there are some grammar and spelling mistakes, which is a bit noticeable when there's a lot of text in the game.
Good job on the prototype!