Paranautical Activity ​is a blisteringly-fast first-person shooter that combines classic​ arena-style FPS action​ with​ ​roguelite elements. An intense and challenging test of precision, skill and reflexes awaits!

Key Features
Unique FPS/Roguelite combination
Procedurally generated levels
Insanely fast gameplay
Hidden levels
Over 100 items
40+ enemies
Ridiculous bosses‏
Kick-ass dub-step soundtrack.

More details on the official game page of Paranautical Activity ...