From GameWatcher: “Hades is Supergiant Games’ next project, now undergoing active development in what is kind-of-sort-of Early Access on the Epic Games Store. Following the major “discount” provided by Epic themselves, where they gave away $10 vouchers to their users, Supergiant increased Hades’ price in the middle of the sale.”
Source: N4G PC Hades Devs say Price Hike during Epic Sale was "a Mistake"