A 3D game where players control an alien set on wiping out humanity. Defeating a human rewards players with a brain, which can be incubated to create an egg, or "host." Hosts can be placed in fallen humans to turn them into loyal minions. Humans come in three classes—melees, ranged, and giants—with variations such as berserkers, halflings, ice and poison shooters, and explosive giants, each bringing unique abilities to overcome. An NPC courier aids by collecting eggs from the incubator and delivering them to the player. Alien upgrades include health, attack speed, tentacle count, and damage. The game features procedurally animated movement for the alien and tentacles, adding fluidity to gameplay.