That was a interesting little proof of concept, took about 12 or so minutes to get through. It seems pretty neat and I can see the potential with the memorization and needing to do stuff quickly.
Honestly, there were two things that I confused me at first.
Firstly, was the mixing time. I am bad with timing, but I managed to match it with the times the little rod centered itself, which I assume is the solution. It was not that intuitive though.
Secondly, was the scale of the liquids. The first pump seems to deposit a little of the fluid, then the third and four ones deliver a lot. It confused me enough to press a fluid more than once a few times.
But besides that, I see the potential. And as always, your art is good.