Paranautical Activity: Deluxe Atonement Edition (instant delivery)

Steam store page:

https://store.steampowered.com/app/250580/Paranautical_Activity_Deluxe_Atonement_Edition/

Release on 2014-10-20

Paranautical Activity combines the classic FPS action of games like Doom and Quake, with the randomness and difficulty of modern roguelikes like Binding of Isaac and Spelunky.