Hey Brother. Great feedback! Haven't played Potion Craft but will definitely check it out. Completely agree with the animations suggestion. The pour animation actual gives rise to a bug which not only doesn't stop the timer until the animation has finished (which is completely unfair on the player) but mangles a whole bunch of other things.
Great suggestion about letting the player pour the bottles. I'd considered that and having a particle system simulate the fluid and add bubbles to the cauldron. But I was pretty hard pressed for time. It was a 3 hour game jam and I was struggling as I wasted a fair chunk trying to figure out how to mix the colours (ended up cheating and implementing a lookup tables as every option resulted in horrible colours)
When I get some time I'll tidy up the code and send it your way (it's an absolute disgrace and mess tbh)