Alien Invasyndrome [v0.9] [Mozu Field/Sixie]

05/25/2025

4 min read 4 min

Through the deep space of thousands of stars,
Exploration Vessel <Atlas> advances steadily.
With a carefully chosen crew of female, they seek for a way to continue the bloodline of humanity.
However, little do they know…
hidden in the silent shadow of the cosmos, another kind also strives to pass on.
Such kind hides in the crowd on the ship, an <Alien Larva> from a distant planet.

Tied to the fate of its bloodline,
it uses every way possible to grasp the faint hope.
Rooting on this vessel, turning these females into breeding beds.
To survive, this is its only way.
It’s only another typical day on < Atlas >, another “normal” day.

In this game, you play as the Alien. Weak in the beginning, you should utilize your
stealth ability to sabotage and grow, eventually dominating the ship.

Thread Updated: 2025-04-30

Release Date: 2025-04-30

Developer: mozu field / 百舌鳥 Steam – DLsite – Ci-en – Patreon – Twitter / Sixie六 – Patreon – Twitter

Censored: No

Version: Demo – 0.9

OS: Windows

Language: English, Japanese

Other Games: mozu field

Genre:

2D Game, 2DCG, Animated, Japanese Game, Ahegao, Rape, Vaginal sex, Mind control, Male domination, Male protagonist, Monster, Puzzle, Creampie, Rpg, Sandbox,

Installation:

1. Extract and run.

Changelog:

v0.9

・Added the full Doctor meeting event. (Mission system not implemented yet)

・Now getting hit looks more responsive

・Something might happen if you attack the Doctor…?

・Now you can repeat sex animation, the’d be some changes on the animation

・Upated UI

v0.83 Demo

・Bugfix

v0.82 Demo

・Added manual pose selection before sex scenes.

・Added sex animation stage control.

・Sex animations are now repeatable.

・Various bugfix.

v0.81 Demo

・Added Clinic, Laboratory and Cafeteria.

・Added 2 new mob crewmates.

・Added event of first meeting with Doctor.

(Dialogue event isn’t implemented yet. This demo will end after the current event)

・Added Int and Str bars. Upgrading and upgrade resources aren’t implemented yet.

・Charging while going into stealth mode is quite buggy.

When you get out of stealth mode while charging, the action will be carried out right after coming out.

・You may now skip the first entrance event by pressing Confirm.

・You may move diagonally now.

・Various bugfix.

v0.72 Demo

・Added Storage room, Clinic Corridor and Cafeteria Corridor

・Added Security Camera, Security Soldiers

・You may now hide under desks.

・Flamethrower will also burn objects.

・Security Soldiers’ sex animation .

・Fixed attack.

v0.65 Demo

・Bug (digital) fix patch

v0.6 Demo

・Implemented Charge Attacks

・Changed the behavior of the security drone, now the drone can be destroyed when exhausting.

・Added HP gauge; when HP reaches 0, the game is over. In the future, the player will be revived in the base after it’s built.

・The UI of the title screen was slightly changed for better understanding.

Charge attacks can be used to capture enemies from any direction as long as the alien is not seen. Charge attacks will be a skill acquired after leveling up in the future.

v0.4 Demo

・Alien attack effects are displayed.

・Fixed a bug that prevented attacks from hitting.

・Fixed a bug related to area movement.

v0.0 Demo

First release

Developer Notes:

At the beginning of the game, please use left and right arrow key to switch language.

The game is Japanese by default.

If the text is not showing, please use Locale Emulator

Feel free to comment on the game, we’ll check this thread from time to time.