Based on "First Blood" mechanics (implied by the title).
Based on the search results, is a tabletop role-playing game (TTRPG) created by Connie Chang, available on itch.io. GOD-KILLER-master.zip
A 734 kB PDF outlining character actions (moves). Based on "First Blood" mechanics (implied by the title)
A 418 kB PDF version optimized for readability or accessibility. Key Aspects of the Game Genre: TTRPG focused on high-stakes narrative. you should unzip the contents
The primary 33 MB document containing the core rules and setting material.
The zip file likely contains the following components, as detailed on the itch.io project page :
To use the GOD-KILLER-master.zip file, you should unzip the contents, read the main rules document first, and print or digitally fill out the character sheet to begin playing.