Hey, it's so great knowing you could play it until the end. We didn't have time to put most of the tutorials the game required, so we were worried that no one would be able to finish it.
About the weight scale, we put only 4 slots for simplicity, and because we didn't think the levels could require more than that. But some ended up being harder than we expected.
About having a reference item, the idea is that you can get to know the exact weight of the ingredients used in previous levels (from the recipe book), so you can use any of those ingredients to compare to the new ones.