Immunity Protocol is a neon pixel-art horde-survival auto-shooter set inside a collapsing biotech system. Deploy a combat sentinel into a living machine gone hostile. Drift through bloodstream channels, corrupted circuitry, synaptic architecture, and fiber-optic kill zones while swarms, elites, roaming hazards, and recurring boss breaches keep tightening the screen around you. You move. Your arsenal fires automatically. Survival depends on positioning, routing, and building something strong enough to outlast the collapse.