The instructions are very unclear. As another person said the controls aren't labeled but you said that's a work in progress. I also am very uncertain what I'm supposed to do for any customer after taking their order which I haphazardly managed to do. I eventually found the surprising fluffy ghost or such room (souls?) and I assume those are the raw ingredients that are part of a customer's order and I choose one that's roughly the same color. I haven't figure out how to do anything with them and it doesn't seem to be left click, right click, or e on the oven like thing or what seem to be alcohol tanks on the opposite counter. I understand a lot of people enjoy games without tutorial but I figured it might be a little helpful to point out this perspective.
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Hey! We know that currently the tutorial section is a bit poor in the explanation and the game does not give any hint about that, we're currently working to add feedback in-game to make it more clear, also we're planning to explain better how to play in game.
Now I'm gonna answer to the problem you had: the room on the left yes, is about exactly what you said, the souls are the ingredients.
If you point the mouse over a soul and you are in a certain range within the soul (this lacks a feedback right now), if all of that is done correctly an outline appears around it and by clicking left or right mouse button you pick it up in your hand (depending on the click), when it's in your hand you can throw it by clicking again.
To make orders you have to throw souls in the machines near you when you spawn. If you want to make an order on a machine with less than 3 souls just press E while pointing the machine (it should highlight).
Hope that I did clear things for you, we'll update the itch description ASAP and thanks for the feedback, it helps!