Alien's Nest

Alien's Nest drops you into a hive built from organic tunnels rather than metal corridors, and it plays that difference for tension: the walls themselves feel like they're part of something alive, and every dark side-passage might be empty or might not be.

Progress leans on environmental puzzles as much as combat, pressure plates, movable objects, and hidden switches gate the deeper sections of the hive, so exploring every branching tunnel pays off even when a room looks like a dead end. Limited light and ammo mean the smarter approach is usually avoiding a nest of creatures rather than fighting through it head-on; waking up a cluster you didn't need to disturb is the fastest way to burn through resources you'll need later in the level. If exploring a dark, hostile space on edge appeals to you, Slender: The Eight Pages runs on that same tension between exploration and avoidance.