"I do can answer your immediate question. The discount is not visible on page, because the first item has no minimum price. But it is on discount, you can find it via tags and see a 50% discount banner. https://itch.io/game-assets/on-sale/tag-science-fiction/tag-side-scroller/tag-to..."
Yes, but if you look at the price of the second pack, it's 2.50 (with discount) and the first is 5. So I'm not sure that the first pack is a discount.