Genre: First-Person Survival HorrorEngine: UnityPlatform: PC
ALIEN ISOLATIONDEAD BY DAYLIGHTDEAD SPACERESIDENT EVIL
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Game OverviewSECTION 01 / 09
A first-person deep-space survival horror experience where players must escape a derelict spaceship inhabited by an adaptive alien entity. PC exclusive, designed for maximum immersion and psychological dread.
Core Concept
Escape a derelict spaceship haunted by an adaptive alien entity
When a survivor directly witnesses another player's death, a cascade of consequences triggers simultaneously — balancing the tactical intelligence gained against the psychological cost of watching a teammate die.
Sanity Penalty
—<5m from kill — −35 sanity; screen distortion, audio spike
—Alien receives a brief notification that position was revealed
—Multiple witnesses each receive marker independently
Last Scream Mechanic
Deceased survivors emit a spatial audio ghost at their death location for 90 seconds — a 3–5s looping audio signature of their final moments. Both survivors and the alien can hear it. The alien may use a body as bait; survivors can use it to infer the alien's recent location. Ghost fades linearly over its final 15 seconds.
Alien Design Tension
Visible kills expose position — incentivising hunts in low-visibility areas, isolated zones, or using the Stalking Phase to reduce witness FOV chance. Evolution abilities creating darkness or audio disruption pair directly with this system.
Multiplayer Progression
XP SystemCosmetic UnlocksAbility UpgradesAlien Evolution Tree
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Gameplay MechanicsSECTION 03 / 09
Core Systems
—Stealth — sound, visibility, movement
—Resources — ammo, oxygen, power
—Crafting — tools & survival items
—Sanity / Fear — affects perception
—Limited Combat — avoidance emphasis
PC Features
—Mouse & Keyboard — precision controls
—Diegetic UI — in-world helmet HUD
—Spatial Audio — enemy tracking cues
—Gamepad Support — optional controller input
—Scalable Graphics — low/high fidelity presets
SANITY SYSTEM EXTENSION // THE ECHO CHAMBER
The Echo Chamber
Areas recently traversed by the alien retain a psychic imprint that interacts exclusively with the Sanity system. Healthy survivors are completely immune. As sanity deteriorates, those same zones begin producing phantom alien sounds drawn from the alien's real audio library — spatially accurate, aurally indistinguishable from the real thing.
Sanity Threshold Behaviour
100–60%
No effect. Zone feels entirely normal.
59–35%
Faint directional audio — distant footsteps, soft breathing. Spatially accurate to imprint location.
34–15%
Moderate echoes, louder and more convincing. Occasional visual shimmer at room edges.
14–0%
Full phantom manifestation. Complete alien audio loop. Brief visual hallucination of alien silhouette. Virtually indistinguishable from real presence.
High Sanity — Tracking Tool
Players above 60% perceive nothing but can infer imprint zones from teammate behaviour. A calm player relaying "it was here recently" creates organic team communication incentives.
Low Sanity — Psychological Trap
At <35% sanity, players in imprint zones instinctively freeze, flee, or hide — wasting time and potentially moving into a real threat. The alien benefits from confusion it did not actively create.
IMPRINT RULES: Generated after 8s continuous alien presence. Decays over 3–5 min. Imprint zones never shown on map or UI. Echo audio fades 8–12s after player exits zone. Alien has zero visibility into survivor echo state.
SETTING: ABANDONED DEEP-SPACE STATION // PROCEDURALLY ALTERED LAYOUTS
Engineering
Power systems, vents, machinery
Medical Bay
Supplies, stasis pods, labs
Cargo Hold
Containers, dark corridors
Living Quarters
Crew remains, personal logs
Replayability Feature
Procedurally altered layouts ensure no two playthroughs share the same spatial arrangement, forcing players to re-learn threat locations each session.
ENVIRONMENT FEATURE // SP + MP
Corpse Interaction & Evidence
Crew remains distributed across the station are interactive environmental objects. Examining them yields forensic evidence about the alien's current ability set, recent evolution state, or patrol behaviour — rewarding thorough exploration with meaningful tactical intelligence at the cost of a 4-second exposure window.
Evidence Types & What They Reveal
CLAW PATTERNS
Deep parallel gouges → Hunt Phase active. Shallow exploratory marks → Stalk Phase. Marks on vent grates → alien using this section's vents.
BURN / ACID RESIDUE
Residue present → alien has unlocked acid or thermal attack. Residue trail → direction of travel post-kill; useful for route prediction.
BITE / COMPRESSION
Clean single strike → alien is confident. Repeated trauma → alien spent time here; strong Echo Chamber imprint zone likely nearby.
VICTIM POSTURE
Found mid-sprint → ambush from ahead. Found crouched/hidden → alien actively searched; it did not stumble upon this victim.
Interaction Rules
—4-second hold input; interruptible with no partial data awarded
—Player stationary during examination; audio input reduced 40%
—Result logged to in-world wrist display (diegetic)
—One evidence category per corpse; re-examining yields nothing
Multiplayer Rules
—Fallen survivors are examinable; cause-of-death populates log
—Alien sees a subtle highlight on already-examined corpses
—Alien can "disturb" examined corpses (3s, audible 10m) — removes the log entry
—Survivor corpses persist the full match; no despawn
ENVIRONMENT FEATURE // SP + MP
Blackout Events
Periodic station-wide emergency blackouts are forced escalation events — not random inconveniences. Every visual and HUD element cuts simultaneously. The alien gains a significant combat advantage. Survivors who have studied the layout survive; those who haven't are at the mercy of the dark.
What Cuts Out
—All room and corridor lighting (emergency strips flicker then fail)
—Diegetic wrist display — cannot be manually activated
—Teammate position indicators
What Remains
—Player's own breathing audio (louder, positional)
—Emergency light: 1–3 random 0.3s flickers total
—Alien audio signature (unchanged — intentional)
—Footstep audio from all nearby entities
Alien Advantage
Movement speed +20% / Detection radius +35% (thermal). Alien HUD remains fully functional. Alien receives an audio cue at blackout start — a direct signal to press aggression. Speed and detection bonus persists 10 seconds after lights return.
Survivor Counterplay
Backup Power Restoration objective (Engineering) requires 2 simultaneous players; ends blackout immediately on completion. Solo attempt takes 3× longer. Glow sticks (craftable) provide 8m dim light but are audible on activation. Crouching and remaining stationary is the safest option for unprepared players.
TIMING: Triggers every 8–12 min (randomised). Duration: 75s standard. Min cooldown between blackouts: 6 min. Early trigger: accidental 15% chance during power restoration sequence.
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Enemy DesignSECTION 05 / 09
Singleplayer AI
—Adaptive learning — tracks player habits
—Vent traversal — uses ship infrastructure
—Darkness exploitation — low-light hunting
—Sound tracking — reacts to noise signature
—Escalating behavior over time
Multiplayer Alien
—Player-controlled entity
—Unlockable abilities via progression
—Evolution system mid-match
—XP-based upgrades
—Cosmetic customization
AI EXTENSION // SINGLEPLAYER // PSYCHOLOGICAL PROFILING
Psychological Profiling System
Layered on top of the base adaptive AI, the Profiling system runs a silent background analysis of the player's aggregate behavioural patterns. It does not replace moment-to-moment AI decision-making but modifies its weighted priorities over the session — making the alien feel like it is learning this specific player, not just reacting to them. Profile state is never surfaced to the player in any form. It must be inferred entirely from the alien's changing behaviour.
Tracked Signals (Sampled Every 60s, Scored 0.0–1.0)
HIDING_FREQ Locker / vent / surface entries
CACHE_PROXIMITY Distance from resource spawns
OBJECTIVE_PACE Time-to-completion ratio
VENT_USAGE_RATE Vent entries per 10 minutes
STATIC_DURATION Avg. time stationary per cycle
ROUTE_VARIANCE Path deviation between revisits
COMBAT_ATTEMPTS Weapon draws / flare deploys
Behaviour → AI Response Table
PLAYER BEHAVIOUR
ALIEN RESPONSE
Frequent locker hiding
Checks lockers 40% more often; lingers 15–20s near known hiding spots
Resource hoarding
Patrol anchor shifts to highest-density supply room; guards it for extended periods
Fast objective rushing
Pre-positions near uncompleted objectives; Stalk→Hunt transition accelerates 25%
Heavy vent usage
Enters vents and waits rather than traversing; vent exit ambush probability +30%
Stationary hiding
Expands area-search radius; uses sound-ping behaviour (shuffling, knocking) more often
Creature of habit (low route variance)
Memorises most frequent route; pre-patrols chokepoints during Observation Phase
Frequent combat attempts
Approaches from behind/vents; retreats and feints rather than pressing head-on
Bluffing & Counter-play
Sustained behavioural deviation over 3+ consecutive intervals resets AI priority weightings. Single-interval changes are smoothed out. A skilled player can effectively "retrain" the alien mid-session.
Reset Conditions
Full wipe on death. −40% weight on all signals on first entry to a new major zone. No profile data persists between sessions. Each run is a clean slate.