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Defend Your Life: TD

Defend Your Life: TD

Defend Your Life! Is tower defense set in human body where players are fighting against villain hordes of viruses and bacteria. Levels and units correspond to reality of human anatomy.

Released Apr 10, 2015 Developer Alda Games Platforms Windows · Mac · Linux Tower DefenseCasualStrategyIndie2D
View on Steam ↗ $9.99 (US · as of 2026-09-26)

What players say

Steam review score and the most-helpful voices, which may include critical ones. Score via Steam as of 2026-09-02 · quoted reviews as of 2026-05-13.

79.4%positive1,092 reviews
Recommended · 0 found this helpful

“Defend Your Life is a tower defense game developed and published by Alda Games that distinguishes itself through a clever and approachable concept: instead of defending castles, roads, or abstract lanes, you are protecting the human body from invading pathogens. This biological…”

— a player, Steam review · 12 hrs played
Not recommended · 1 found this helpful

“I absolutely do NOT recommend this ♥♥♥♥♥♥♥♥ game, I got all achievements and I only have this many hours because of SAID achievements. What made this experience so terrible you may ask? Well, not only was I mind-numbingly trying to get the achievements, the stupid music score…”

— a player, Steam review · 20 hrs played
Read more reviews ↗

Achievement stats

Global completion rates across all Steam players — a data view of how far people actually get. Source: Steam official stats · as of 2026-09-26.

20achievements
10.7%median completion
5.3%rarest: Super hero
49.8% of players 35.0% of players 30.6% of players 29.4% of players 23.4% of players 20.4% of players 19.2% of players 18.0% of players 13.9% of players 12.9% of players 10.7% of players 9.3% of players 9.0% of players 8.8% of players 8.6% of players 7.7% of players 7.7% of players 6.2% of players 5.6% of players 5.3% of players 49.8% 0% most earned rarest
Almost everyone has
49.8%First win — Win one level
35.0%Medic — Kill 1.000 enemies
30.6%Boss killer — Kill boss
Rarest badges of honor
5.3%Super hero — Get hero to level 50
5.6%Tabletsman — Get 100 tablets
6.2%Rescuer brain — Win level in the brain

Price tracking

US-region pricing (USD), sampled twice daily by our own tracker since 2026-08-12. Steam prices vary by region — always confirm your local price on Steam.

$9.99current · sampled 2026-09-26 21:12 UTC
$3.99lowest since tracking began2026-08-24
US9.99 USD
EU9.75 EUR
UK8.50 GBP
Australia14.50 AUD
Canada12.99 CAD
Japan1,200 JPY
Brazil32.99 BRL
China42.00 CNY

Regional prices at last sample, in local currency — Steam sets each region's price independently.

China≈$6.3 Brazil Japan Canada US Australia EU UK≈$11

Cheapest → most expensive, converted to USD at ECB reference rates (2026-09-25). Relative comparison only.

$0 $10 $20 08-12 08-21 08-30 09-08 09-17 09-26

Latest official news

Developer announcements via the Steam news API — links go to the original posts. More across all games on the news hub.

Dec 07, 2017
Band of Defenders is Coming Soon on Steam

Hi all, we would like to show you our upcoming game, Band of Defenders, that is now "Coming Soon on Steam". You will find it here: http://store.steampowered.com/app/644640/Band_of_Defenders/ It is pos

Dec 07, 2017
Band of Defenders is Coming Soon on Steam

Hi all, we would like to show you our upcoming game, Band of Defenders, that is now "Coming Soon on Steam". You will find it here: http://store.steampowered.com/app/644640/Band_of_Defenders/ It is pos

May 15, 2015
Update 3 - Cloud save and bug fixes

★ Steam Cloud support! ★ Framerate optimization ★ Correct Super Hero achievement count ★ Fixed persistent adrenaline animation after using 2 adrenaline bonuses at one time

May 15, 2015
Update 3 - Cloud save and bug fixes

★ Steam Cloud support! ★ Framerate optimization ★ Correct Super Hero achievement count ★ Fixed persistent adrenaline animation after using 2 adrenaline bonuses at one time

Apr 24, 2015
Update 2 - new level and enemy boss, bug fixes...

★ New level and new BOSS - in thigh ★ Optimization of loading ★ Better controls using keyboard (R - 4x, 2x, 1x speed game) ★ Better controls using keyboard (ESC and arrows for moving in select level m

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From our knowledge graph — ranked by shared traits, not a black box. Each card says why it's here.

CHUCHEL CHUCHEL 85.0% · 1,697 reviews shares Cartoon, Hand Drawn, Cartoony, Stylized Kingdom Rush - Tower Defense Kingdom Rush - Tower Defense 95.8% · 5,700 reviews shares Tower Defense, Cartoon, Tactical, Cartoony Carto Carto 94.3% · 2,502 reviews shares Cartoon, Hand Drawn, Stylized, Top Down Sudocats Sudocats 98.1% · 1,083 reviews shares Education, Hand Drawn, Cartoony, Stylized Pilgrims Pilgrims 95.6% · 1,780 reviews shares Cartoon, Hand Drawn, Cartoony, Stylized Plants vs. Zombies GOTY Edition Plants vs. Zombies GOTY Edition 98.2% · 45,975 reviews shares Tower Defense, Tactical, Survival, Funny Cats Organized Neatly Cats Organized Neatly 97.7% · 2,460 reviews shares Hand Drawn, Cartoony, Stylized, Funny Dogs Organized Neatly Dogs Organized Neatly 98.6% · 703 reviews shares Hand Drawn, Cartoony, Stylized, Funny

Screenshots

Official Steam store screenshots — click any shot to enlarge.

Facts & details

From the Steam store record, snapshot 2026-05-13.

GenresAction, Casual, Indie, Strategy
Player tagsTower Defense · Casual · Strategy · Indie · 2D · Cartoony · Funny · Singleplayer · Puzzle · RTS · Survival · Real Time Tactics (SteamSpy community voting)
FeaturesSingle-player · Steam Achievements · Steam Trading Cards · Family Sharing
LanguagesEnglish * , French, Italian, German, Spanish - Spain, Czech, Japanese, Portuguese - Portugal, Russian, Simplified Chinese *
Achievements20
Official sitehttp://defendyourlife.aldagames.com/
Minimum system requirements (PC)

Minimum: OS *: Windows XP Service Pack 3 Processor: Dual Core CPU Memory: 1 GB RAM Graphics: OpenGL 3.0 compliant with 512MB of video RAM. Storage: 400 MB available space