Alien Invasyndrome Platforms — Windows Steam Only, No Official APK

Official platform truth (21 August 2026 check)

Alien Invasyndrome is a Windows stealth-action title. Developer Mozu Field / 百舌鳥, publisher Shady Corner Games. The full game is Steam app 4603980 with release still TBA. The playable product today is the Steam Demo, listed as app 4830300, with a store release date of 24 July 2026. Adult 18+. This page exists because search results now mix that official Demo with unofficial Android APK pages and “free download” mirrors that this wiki will never endorse.

Install path: Demo Access. Store flags: Steam Status. Hardware: System Requirements. Hub: Updates Hub.

What Steam actually lists

Channel	App ID	Status (Aug 2026)
Full game	4603980	Coming soon / TBA, Windows, single-player, Family Sharing flag
Demo	4830300	Released 24 July 2026, free Demo, Windows

Both listings share the same adult content descriptors and English + Japanese interface/subtitle lines. Neither listing advertises macOS, Linux, consoles, or a first-party mobile client.

Practical reading:

1. Wishlist and follow 4603980 if you want the TBA full game.
2. Install the Demo from the same store page (Steam attaches Demo 4830300).
3. Treat your library version string as the content checkpoint — community trackers still describe Demo 1.0 hotfix (5 May 2026) as the slice inside that Steam package (Changelog, Version History).
4. Do not confuse “Steam published the Demo in July” with “a new 1.1 content drop landed.” July is the store date. May is the build nickname still used in tracker notes.

Windows only — what that means in practice

Steam reports Windows for both the Demo and the full game. There is no Mac or Linux depot in the public store payload we re-checked. If a friend plays on Steam Deck, that is still a Windows-compatibility story, not an official native Linux build.

Before you blame missing rooms on a “wrong platform build”:

• Confirm OS Windows 10+, OpenGL 4.1, and ~1 GB free space on System Requirements.
• Treat Steam’s odd 4 MB RAM minimum versus 4 GB recommended as a listing quirk, not as proof a phone can run the Demo.
• If Japanese glyphs fail, that is a locale issue (Locale Emulator), not an Android port.

No official Android APK

Third-party pages advertise Alien Invasyndrome APK files, sometimes with fake “updated August 2026” stamps and Android 5.0+ claims. As of this wiki’s 21 August 2026 pass:

• Steam’s official data is Windows PC.
• Publisher support listed on the store points to shadycorner.com / the Steam page — not an official Play Store listing.
• An APK that reuses the game’s name is not a verified mobile release.

This wiki will not link APK hosts, torrent packs, or “free full game” pages. They create fake bugs (missing Kitchen, broken saves, wrong skill labels) that then get pasted into Discord as “wiki is wrong.” Play the Steam Demo, then report real Atlas issues with a version string (Softlock Fixes).

Family Sharing and single-player

The full-game store payload lists single-player and Family Sharing. That does not mean two-player Atlas. It does not mean you should share unofficial installers. Family Sharing, when Steam enables it for a purchase, follows Steam’s own rules after the TBA full release exists. The Demo remains the legal try-before-wishlist path today.

Why July 2026 and May 2026 both appear on this wiki

Players search “when did the Demo come out” and get two honest dates:

• 5 May 2026 — Demo 1.0 hotfix nickname used by update trackers and older patch-note roundups.
• 24 July 2026 — Steam’s Demo app 4830300 release date on the store API.

Both can be true at once. Mozu Field shipped playable Demo builds for a long time (0.65 → 0.99 → 1.0). Shady Corner Games then published that Demo as a Steam store product in July. If your library shows the official Demo, you are on the supported path regardless of which nickname a YouTube title uses.

Scope of the slice: Demo Scope. Patreon numbering can still diverge: Patreon vs Steam.

Region restrictions are not a platform note

The Demo store payload lists CN, DE, SA as restricted distribution zones — a publisher decision driven by the adult content descriptors on the Steam product, not by the platform itself. The store page returns “unavailable in your region” for players in those countries regardless of account settings. This is the same Demo (Windows, Steam); the only difference is regional availability. See Region Restrictions for the disambiguation checklist and Age Rating & Content Descriptors for the descriptor list that drives the restriction.

Adult store gates are not a platform

Steam may hide the page until you enable adult content in your own account settings. That is a discovery filter, not evidence the game “moved to Android.” Do not bypass it with random APKs. Character pages stay mechanical: Characters Hub.

After a clean Windows install

1. Note the Steam version string (Changelog).
2. Confirm pause / command-list verbs on Pause Menu so you can change language without quitting blind.
3. Learn title-screen key 1 recall on Title Screen.
4. Run the larva loop on How to Play and First Session.
5. Keep Guides Hub and Walkthrough Hub for rooms — this page is only the platform filter.

Related reading

• Demo Access
• Steam Status
• Demo Scope
• System Requirements
• Updates Hub
• Review Hub if you are still deciding the wishlist

Bottom line

Alien Invasyndrome’s official play path in August 2026 is Windows Steam: Demo 4830300 (store date 24 July 2026), full game 4603980 still TBA. There is no official APK. Ignore mobile mirrors, confirm your PC against System Requirements, and treat May’s 1.0 hotfix name as the content checkpoint inside the July Steam package.