Subnautica is an open world underwater exploration and construction game. We are Unknown Worlds, the developers of Natural Selection 2, and Subnautica is our new project. Subnautica will combine elements of role playing, sandbox, exploration and cinematic games to create a unique experience, the genre of which we do not believe has yet been invented.
The scene in Lava Zone 2 is not one of combat. Though the creatures appear threatening, and the player in the bipedal suit appears well equipped to defend themselves, this is a scene of nuanced play. Perhaps these creatures will defend this area, unless distracted by an environmental interaction elsewhere. Perhaps killing them destabilises the food chain of the surrounding biome, causing smaller lifeforms essential to player survival to die out.