Instead of just picking up glowing icons for health and ammo, this feature turns the themselves into your primary resource.
Ripping chitinous plates from heavy aliens provides a temporary, decaying shield that blocks projectiles but slows your movement. alien-shooter-1-pc-game-free-download
Collecting cores from "boss" or "elite" aliens triggers a 5-second "Synapse Overload" (Slow-motion/Bullet-time) allowing you to reposition when the screen is 100% full of monsters. Instead of just picking up glowing icons for