A potion mixer restaurant game, that's a sweet combination! I like the character art, they have a nice variety of designs! I want to see what happens after you serve the customers. Maybe some can be unique and have post-work stories if you've helped them on that day?
There's no recipe book, so I wish that the mix results were more predictable to help with memorization. Perhaps there can be a main ingredient that sets the color of what you're making to narrow down the pool of possibilities?
The sound cues and music are suitably fitting, but the soundtrack overlapped at a few points. The ingredients can feel a bit far to drag when you do it so repeatedly, so maybe the cauldron can be closer to the right?
I think you've hit upon a very neat idea, it just needs some tuning to help players keep track of things better.