Comparison

Alien Evolution vs Space Tower Defense

Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.

Head to head
About

Alien Evolution

Control a small alien organism, devour cells and smaller creatures to grow and evolve into a powerful kaiju monster. Unleash rage mode to dominate the neon space world and climb the food chain.

Highlights
  • Devour cells and monsters to evolve
  • Mutate into giant titan kaiju forms
  • Unleash devastating RAGE mode
  • Explore a neon alien universe
  • Easy one-hand io controls
  • Grow and dominate the food chain
Features
Read full description

Alien Evolution: Kaiju Monster is a neon io-style action game where you control a tiny alien organism and devour everything in your path to evolve into a galaxy-crushing kaiju monster. Start as a small mutant creature drifting through deep space. Hunt glowing cells, swallow smaller monsters, and absorb their DNA to grow bigger and stronger. The more you eat, the faster you evolve — from a fragile alien spore into a massive, unstoppable titan beast that dominates the universe. Every cell you devour fills your evolution bar and charges your RAGE mode. Trigger RAGE to smash through swarms of alien creatures, blast enemy monsters, and feed your endless hunger. Climb the food chain, hunt bigger prey, and become the apex predator of the galaxy. GAME FEATURES ▶ EAT & EVOLVE — Devour cells and monsters to grow your alien beast and unlock powerful new evolution forms ▶ KAIJU MONSTER FORMS — Mutate from a tiny organism into a giant titan kaiju with stunning neon designs ▶ RAGE MODE — Unleash devastating power and rampage through enemy swarms ▶ NEON SPACE WORLD — Explore a glowing alien universe packed with strange creatures and cosmic monsters ▶ EASY io CONTROLS — Simple one-hand gameplay with a deep evolution system that's hard to put down ▶ GROW & DOMINATE — Collect orbs, power up your beast, and rise to the top of the food chain Whether you love io games, monster-eating action, or kaiju rampage adventures, Alien Evolution: Kaiju Monster delivers addictive eat-and-grow gameplay you can enjoy anytime, anywhere. Download now, begin your alien evolution, and grow into the most terrifying kaiju monster in the galaxy!

About

Space Tower Defense

Defend your home planet in a futuristic space strategy game. Build and upgrade orbital satellites to survive waves of unique enemy spaceships. Adapt your tactics to overcome escalating challenges and boss encounters.

Highlights
  • 30 handcrafted waves
  • Multiple enemy types with unique abilities
  • Orbital satellite towers with upgrade progression
  • Boss enemies and escalating wave combinations
  • Tactical boosts for critical moments
  • No ads
Features
Read full description

Defend your home planet in a futuristic space tower defense game. Build orbital satellites around your planet, upgrade their power, and survive wave after wave of incoming enemies. Each enemy planet sends a different type of geometric spaceship with its own behavior, speed, armor, and special ability. Plan your defense, combine different satellite weapons, and adapt your strategy as the waves become harder. Features: • 30 handcrafted waves • Multiple enemy types with unique abilities • Orbital satellite towers with upgrade progression • Boss enemies and escalating wave combinations • Tactical boosts for critical moments • No ads Simple to play, hard to master :-)

Screenshots

Alien Evolution4 screens
Space Tower Defense4 screens

Verdict

The call

The clearest difference is ads: Space Tower Defense at none against Alien Evolution's shown. Space Tower Defense also leads on update cadence (weekly vs monthly) and rating (5.0 vs 4.7). Alien Evolution's advantage is ratings volume (7 vs 2) and iOS requirement (15.0 vs 18.5). On price, review sentiment, in-app purchases and monetization model there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Alien Evolution sells 2 one-off in-app purchases and Space Tower Defense sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Space Tower Defense holds the better App Store score, 5.0 against 4.7. Both are backed by a comparable volume of ratings — 7 and 2 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

Alien Evolution ships an update monthly, Space Tower Defense weekly. The most recent releases landed on October 15, 2026 and October 22, 2026 respectively.

Scorecard5 real differences · 5 level
Alien Evolution versus Space Tower Defense: the parameters behind the verdict, then further details
ParameterAlien EvolutionSpace Tower Defense
PriceFreeFree
Rating4.7 (7 ratings)5.0 (2 ratings) — better
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings7 — better2
Update frequencyMonthlyWeekly — better
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.0 — better18.5
Further details — not scored
Size117 MB21 MB
Age rating12+4+
DeveloperKittipong RukpanitmaneeTobias Ehret

Customer experience

Alien Evolution

All ratings7 ratings
Positive85.7%
Neutral14.3%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Space Tower Defense

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

2 purchases

Alien Evolution

One-time2
  • Skill Point Pack 1$0.99
  • VIP Pass$2.99
1 purchases

Space Tower Defense

One-time1
  • Full Game Unlock$1.99

Questions

Is Alien Evolution free?
Alien Evolution is free to download, with in-app purchases available.
Is Space Tower Defense free?
Space Tower Defense is free to download, with in-app purchases available.
Which has better reviews, Alien Evolution or Space Tower Defense?
Space Tower Defense is rated higher. Alien Evolution averages 4.7 out of 5 from 7 ratings, while Space Tower Defense averages 5.0 from 2 ratings.
Do Alien Evolution or Space Tower Defense have ads?
Alien Evolution shows ads; Space Tower Defense does not.
Which is updated more often, Alien Evolution or Space Tower Defense?
Alien Evolution ships an update monthly, and Space Tower Defense weekly. Most recently, Alien Evolution was updated on October 15, 2026 and Space Tower Defense on October 22, 2026.

Other comparisons