I like your idea. It's pretty engaging. Some tips from my onboarding:
- The background images are very beautiful. However I think they have too much colour and details thus bottles and cauldron do not stand out as they should. It's hard to tell what's clickable and what's not.
- The tutorial popup should be changing positions. I suppose it's placeholder and eventually will be replaced with some pointing hand / arrow. But still. For now the first tip is misleading. I thought you want me to click the cauldron.
- After filling first ingredient I see 1/3 of the potion is ready. But in the book I see only two colors. I assumed the first one is already poured in and was confused why cannot I pour the second color.
- On stage 6 where you introduce yellow color. Is it totally random? I've tried getting new color until I filled up all the potions. Then I thought: "Ok, I'm stuck." If it's intended I would show once again the tip that you can return the liquid to the cauldron. If color draws are random I suggest faking em for the onboarding purpose.
- I think it would be nice to count pouring stuff from / to cauldron as normal move. I suppose it would require some effort and balancing. Just think it may be worth it.
Hope this helps you with making your game better. Good luck with the project! :)