https://www.pcgamer.com/the-roguelite-fps-ziggurat-goes-free-in-the-gog-summer-sale/

It's easy to forget in the midst of all this E3 madness, but other things are happening too. Things such as the GOG Summer Sale, which is now into its second week and giving away another free game: Ziggurat, a fast-paced roguelite FPS in the spirit of games like Hexen and Painkiller.

Along with the usual array of fantasy FPS firepower, Ziggurat gives players special abilities, perks, and equipment to keep things interesting. There's no inventory management involved, however, just weapon selection and health/mana to take care of. Levels are procedurally generated, and death is of the perma-sort, meaning (hopefully) a high degree of replay value and lots of ragequits ahead.