Compare MUTATION PHASE prices across trusted key stores and find the best deal. Developed by IGRODELSKY. Published by IGRODELSKY. Released on 10/5/2018. Available on PC. Genres: Action, Indie.

A scrappy one-dev horror FPS with a sci-fi premise that takes under an hour to clear - low bar to clear, but honest about what it is and occasionally unsettling because of it.

I went into MUTATION PHASE expecting the bare minimum from a sub-five-dollar solo-developer FPS, and what I found was something messier and more interesting than that framing suggests. You play as a research complex engineer who managed to hold his sanity while everyone around him - staff and locals alike - had their DNA rewritten by rogue sound-wave experiments. That setup is genuinely creepy if you let it sink in, and the game leans just hard enough into the body-horror implication that the atmosphere lands in places. The structure is straightforward: a story mode that walks you through the premise and teaches you the basic mechanics, followed by a survival mode that unlocks once the campaign is done. Story mode is short - third-party estimates put completion around fifty minutes - so you are not signing up for a slog. Survival mode asks you to hold off horde waves across multiple locations, which is where whatever replay value exists lives. The mutants fill corridors and outdoor spaces aggressively enough that the survival loop has a low-key tension to it, even if the moment-to-moment gunplay is utilitarian at best. Built in Unity with low system requirements, the game runs cleanly on modest hardware, which is at least one thing working in its favor. The cracks are visible. MUTATION PHASE carries an Early Access label and the rough seams that come with it: environments feel sparse, enemy variety is limited, and the sound design does only so much to paper over assets that a solo developer clearly had to stretch. The Steam review pool is thin - around nineteen reviews at a roughly 68 percent positive rate - which tells you this is a micro-niche title rather than a hidden gem with a quiet cult following. The gore splatter on kills is present and functional, if not particularly imaginative. Who is this actually for? Horror FPS completionists who want to tick an obscure 2018 entry off their list. Players who find something oddly meditative in scrappy single-dev work where the ambition outpaces the production budget. If you are expecting a polished corridor shooter with atmospheric lighting and a memorable soundtrack, the expectation mismatch will sting. But if you can tune into the frequency of a developer trying hard with limited tools, there is a faint signal worth catching here - the sound-wave premise alone is more conceptually interesting than most low-budget horror shooters bother to be. Kai, Scout Team

MUTATION PHASE

MUTATION PHASE

Oct 5, 2018IGRODELSKY
GamerScout Says

A scrappy one-dev horror FPS with a sci-fi premise that takes under an hour to clear - low bar to clear, but honest about what it is and occasionally unsettling because of it.

PC
Best Price Available
€1.63
at Kinguin
Lowest tracked: €1.63
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GamerScout Verdict

Best for budget horror FPS completionists who can forgive rough edges in exchange for a genuinely odd sci-fi premise.

Compare Prices(4 stores)

KinguinBest price
StandardGlobalSteam KeyKey
€1.63
Priced in EUR by the store
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StandardEurope (EU)Steam KeyKey
€1.99
Priced in EUR by the store
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StandardGlobalSteam KeyKey
€1.99-50%
Priced in EUR by the store
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StandardGlobalSteam KeyKey
€2.60-19%
Priced in EUR by the store
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StandardEurope (EU)Steam KeyKey
€3.99
Priced in EUR by the store
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Price History

Lowest tracked
€1.6331 Aug 2026
Current best
€1.63
Lowest since we started tracking
Keyshops
€1.59€1.74€1.88€2.036 Jun29 Jun23 Jul15 Aug7 Sept
6 Jun — 7 Sept
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Screenshots & Media

About MUTATION PHASE

I went into MUTATION PHASE expecting the bare minimum from a sub-five-dollar solo-developer FPS, and what I found was something messier and more interesting than that framing suggests. You play as a research complex engineer who managed to hold his sanity while everyone around him - staff and locals alike - had their DNA rewritten by rogue sound-wave experiments. That setup is genuinely creepy if you let it sink in, and the game leans just hard enough into the body-horror implication that the atmosphere lands in places. The structure is straightforward: a story mode that walks you through the premise and teaches you the basic mechanics, followed by a survival mode that unlocks once the campaign is done. Story mode is short - third-party estimates put completion around fifty minutes - so you are not signing up for a slog. Survival mode asks you to hold off horde waves across multiple locations, which is where whatever replay value exists lives. The mutants fill corridors and outdoor spaces aggressively enough that the survival loop has a low-key tension to it, even if the moment-to-moment gunplay is utilitarian at best. Built in Unity with low system requirements, the game runs cleanly on modest hardware, which is at least one thing working in its favor. The cracks are visible. MUTATION PHASE carries an Early Access label and the rough seams that come with it: environments feel sparse, enemy variety is limited, and the sound design does only so much to paper over assets that a solo developer clearly had to stretch. The Steam review pool is thin - around nineteen reviews at a roughly 68 percent positive rate - which tells you this is a micro-niche title rather than a hidden gem with a quiet cult following. The gore splatter on kills is present and functional, if not particularly imaginative. Who is this actually for? Horror FPS completionists who want to tick an obscure 2018 entry off their list. Players who find something oddly meditative in scrappy single-dev work where the ambition outpaces the production budget. If you are expecting a polished corridor shooter with atmospheric lighting and a memorable soundtrack, the expectation mismatch will sting. But if you can tune into the frequency of a developer trying hard with limited tools, there is a faint signal worth catching here - the sound-wave premise alone is more conceptually interesting than most low-budget horror shooters bother to be.

Kai
Kai · Scout Team

Indie & narrative

Tags

singleplayerachievementstier:sub-5Body HorrorSolo DeveloperShort RuntimeHorde SurvivalUnity EngineSci-fi HorrorLow Spec

System Requirements

Minimum

OS
Windows 7/8/10
Memory
2 GB RAM
Storage
3 GB available space
Graphics
Intel HD graphics 610 or Nvidia GeForce GT 440 GDDR5 (1GB), or equivalent
Processor
Pentium Dual Core 2.4 GHz or equivalent

Recommended

OS
Windows 7/8/10
Memory
4 GB RAM
Storage
3 GB available space
Graphics
Nvidia GeForce GT 740 GDDR5 (2GB) or equivalent
Processor
Pentium Dual Core 3.5 GHz or equivalent

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Game Info

Developer
IGRODELSKY
Publisher
IGRODELSKY
Release Date
Oct 5, 2018

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Best price€1.63
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Frequently asked questions about MUTATION PHASE

How much does MUTATION PHASE cost?

As of 7 September 2026, the cheapest in-stock offer for MUTATION PHASE is €1.63 at Kinguin, out of 5 live offers we track across verified key stores. Prices change daily — the table on this page is refreshed continuously.

Where can I buy MUTATION PHASE cheapest?

The lowest in-stock price we track for MUTATION PHASE is €1.63 at Kinguin (7 September 2026). We compare 5 live offers from verified key stores — the full table with every store and its trust score is on this page.

What platforms is MUTATION PHASE available on?

MUTATION PHASE is available on PC.

When was MUTATION PHASE released?

MUTATION PHASE was released on 5 October 2018.

Who developed MUTATION PHASE?

MUTATION PHASE was developed by IGRODELSKY.