Given that the art assets at your disposal will probably be limited (but excellent) for quite some time, you’ll want to constrain the story to fit that world.
The story could be made basically by listing out all the art assets and creating a story tailor-fitted to that.
cyberpunk-detective is looking for clues in
They find a clue that leads them to
cyberpunk-corridor. Out of nowhere appears a
mech-unit that tries to kill the detective, but the detective outsmarts it (or just karate chops it), destroying it in an
cyberpunk-detective-environment, the detective puts on their
space-marine combat suit.
Detective: “It’s time to start investigating” // cocks space-shotgun