Revulsion

Revulsion is a mix between old school classic first-person shooters and modern-day first-person shooters. Revulsion takes classic Doom and Quake style gameplay and combines it with the core concepts that permeate the Dark Souls design philosophy. Revulsion also includes light RPG elements such as leveling, crafting, and upgrading your equipment. There is a large amount of potential loot that you can discover. (Steam Store description)