CTHON

"CTHON is a sci-fi first-person shooter set in the 24th century, where evil has awakened in the Epsilon Eridani system. Pythos colony's moon harbors a terrifying secret, and by utilizing advanced alien technologies, you'll transform into a cybernetic killing machine to battle through an ever-changing labyrinth of aberrant creatures. Get your Steam key if you purchased from itch.io and prepare to face the greatest threat to mankind."