Great game! It's very much "Paper's Please with the Knapsack Problem", and even though the basic gameplay is very simple, it is delivered really well here. The ability to place weights on both sides of the scale is what makes the game click.
I managed to buy Saffron around day 6, but by that point the game became a bit too boring (which makes sense with the limited dev time). If you ever decide to make it a full game, I imagine you could add all sorts of new mechanics to "spice things up": sacks with holes that slowly leak out spice, special weights that need to be saved for special people, bonuses/penalties for finishing fast or delaying too long during each customer's turn... and of course, plot!
UX-wise, my criticism is all minor:
- It's very hard to tell how much money each sale gives you and why. This information is important so that I can better decide if I e.g. prefer to sell [6/7 + 3/10] or [3/7 + 6/10]. I know the color system (white vs yellow) helps, but it doesn't help enough to figure these small details out. I also don't know if sometimes it's better to stop and do nothing rather than confirm a very bad deal.
- Dragging my cursor back and forth got a bit painful for my hand after a while... some hotkeys would be nice. For example: assign the numbers 1,2, 3,4, 5,6 to the halves of the scales, then let me press 3 while hovering over a weight to automatically place that weight on the left side of the second scale.
- Make it easier to remove a specific weight from the scale after it was placed. Currently they all overlap.
Thanks for making it!