Developer: eranboi
At a glance
45 Steam reviews rate it “Mostly Positive” (71% positive). Released on March 29, 2026 by eranboi. Current price: $3.99.
Description
In Immunica, YOU are the immune system. Pathogens are flooding in. Your health is dropping. Every second counts.
Control the immune system from within. No clicking required. Just move, position, and watch the chaos unfold as your weapons automatically tear through waves of invaders.
ACTIVE SURVIVAL + IDLE PROGRESSION
Hover over enemies to deal damage. Your cursor is your primary weapon. Meanwhile, missiles lock on, beams fire, drones orbit, and burst pulses detonate around you. Focus on positioning while your arsenal handles the rest.
4 WEAPON SYSTEMS
Burst - AOE pulse centered on your cursor
Missiles - Homing projectiles that hunt down targets
Beam - High-damage laser for focused destruction
Drones - Orbiting allies that intercept incoming threats
FEVER MODE
Chain kills to build your Fever meter. When it fills, unleash devastating power: up to +500% damage across 5 escalating tiers. The more you kill, the stronger you become.
40+ PATHOGEN SPECIES
Face 8 pathogen types across multiple tiers. From tiny Prions to massive Helminths, each species brings unique behavior patterns. Every pathogen has 3 evolution levels: Normal, Mutant, and Alpha. Higher tiers mean deadlier enemies and greater rewards.
RESEARCH LAB
Between breaches, manage your own research laboratory. Collect pathogen samples from combat and assign them to your scientists. Hire interns, technicians, researchers, and senior scientists. Each has different processing speeds, efficiency rates, and capabilities. Watch your team analyze samples even while you are away. Progress continues offline for up to 8 hours.
Your goal: accumulate enough Vaccine Data to complete the cure.
DEEP UPGRADE SYSTEM
Over 200 upgrades across multiple categories. Improve your cursor damage, fire rate, and critical chance. Unlock weapon systems and enhance their power. Strengthen your core health and damage resistance. Every protein spent makes you permanently stronger.
BREACH MODIFIERS
Each run randomly selects 1-3 modifiers from 30 possibilities:
Buffs - Advantages that boost your power
Nerfs - Increased difficulty with bonus protein rewards
Weird - Strange effects that completely change how the game plays
KEY FEATURES
Satisfying incremental progression that persists across runs
Active cursor gameplay combined with automated weapons
Idle lab management with offline progression
40+ pathogen species with 3 evolution levels each
30 breach modifiers for endless variety
Hidden synergies to discover through gameplay
Work toward a final goal: completing the vaccine
Supported languages: english, french, italian, german, simplified chinese, portuguese - brazil, japanese, russian, turkish, vietnamese, spanish - spain, portuguese - portugal
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Description and screenshots are provided by the publisher via the Steam Store page.
System Requirements
Windows
- OS *: Windows 7 or newer
- Processor: 2.5Ghz or better
- Memory: 2 GB RAM
- Storage: 500 MB available space
- Memory: 4 GB RAM
Mac
- Processor: Apple Silicon, Intel
- Memory: 2 GB RAM
- Storage: 500 MB available space
- Memory: 4 MB RAM
User Reviews
nice game
This game has an interesting concept, but the execution leaves a lot to be desired due to frustrating mechanics and poor design choices. For starters, there is no way to end a run immediately. You either have to play through the entire thing or quit out to the main menu. On top of that, once you actually beat the game, it just kicks you straight back to the main menu instead of letting you continue playing. It feels like a huge letdown when you are invested and just want to keep your run going.
Managing the lab is a headache. Once you place stations and shelves, the game does not let you move them. Your only option is to sell lab/prestige to clear everything out. To make matters worse, the placement rules are inconsistent. Somehow, you can place a station next to a shelf, but you cannot place a shelf next to a station. Also, when you buy more than ten researchers, their characters just overlap each other. There is no dedicated counter to tell you how many researchers you own or how many of each type you have, which makes managing them a mess.
The pacing and menus also have some glaring issues. Whenever a research task is completed, a popup stays stuck on your screen for ten seconds, and you just have to sit there and stare at it because it locks you out of clicking anywhere else. The menu navigation is equally frustrating. If you are on the skill tree screen and go to the lab to collect points, clicking the "back" button takes you to the battle screen instead of back to the skill tree. You go to the lab specifically to get points to spend on upgrades, but the game basically forces you into a battle instead.
The game also does a terrible job of explaining its deeper mechanics. While it teaches you about the battle screen and the lab, it never explains the skill tree or the evolutions. It uses official scientific names like plasmodium, ecoli, and viroid without giving any context. I had to look them up just to figure out what they were. I also have no idea what mutant pathogens are or what actually triggers them. There is an achievement for getting 50 mutant pathogens in a single run, but after beating the game multiple times, I only ever saw about 6 out of 50.
The Insight HQ mechanic makes zero sense as well. After selling the lab/prestige, the game gave me insight points, but I could never figure out how to use them. Even though I had more than enough to afford an upgrade, there was no clear way to actually spend them.
Finally, the settings menu feels unfinished. If you go to the language options, there are three blank choices in the dropdown. When you click on them, they are just blank, which sums up how unpolished the rest of the experience is.
Bugs
Super grindy
Unsatisfactory scaling
Annoying prestige mechanics
Useless short range weapons
Nothing's thought out
Should have played < 2 hrs and get a refund
Game starts to stutter after a few runs. Gets annoying having to restart every 10 mins to play without stutters. Progression also feels slow even with the update, making it feel like I have zero progress. Also whose idea it is to put REVERSE controls into this?
Great game. Respect to the dev for the polished price. 🇵🇱
Additional Information
| Developer | eranboi |
| Platforms | Windows |
| Age rating | None |
| Release date | March 29, 2026 |
| User reviews | 71% positive (45) |