Your rifle fires on one wavelength — whatever the sky is tuned to. Hostiles only take damage when their band matches the background. Fire on a mismatch and the round refracts: no damage, heat spike, and the company docks your pay.
Wrong colour coming at you? Don't shoot it — get out of its way. Jump the ground ones, kneel under the flyers. Once it's behind you it's someone else's problem.
Crawlers hug the deck — you have to kneel to put a round in one. Flyers need you standing.
You stop walking to fire, vent or kneel — and the deck starts to take hold of your boots. Stand still too long and it has you.
Run out of health and you're gone. Run out of money and you're fired.