: The Tentacles entity is a highlight of the demo, showcasing a unique and terrifying design. Its movements and interactions with the environment and player are both mesmerizing and frightening.

The game is set within , a high-security containment facility that has fallen into a catastrophic "Containment Breach." Unlike the standard SCP: Containment Breach , Nexus often focuses on a specific narrative perspective, typically a Class-D personnel or a Security Officer trapped in the lower levels.