Alien Evolution vs Space Tower Defense
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
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.
- 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
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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!
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.
- 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
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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
Verdict
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
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.
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.
Alien Evolution ships an update monthly, Space Tower Defense weekly. The most recent releases landed on October 15, 2026 and October 22, 2026 respectively.
| Parameter | Alien Evolution | Space Tower Defense |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (7 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 7 — better | 2 |
| Update frequency | Monthly | Weekly — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 18.5 |
| Further details — not scored | ||
| Size | 117 MB | 21 MB |
| Age rating | 12+ | 4+ |
| Developer | Kittipong Rukpanitmanee | Tobias Ehret |
Customer experience
Alien Evolution
Space Tower Defense
In-app purchases
Alien Evolution
- Skill Point Pack 1$0.99
- VIP Pass$2.99
Space Tower Defense
- Full Game Unlock$1.99
Questions
Is Alien Evolution free?
Is Space Tower Defense free?
Which has better reviews, Alien Evolution or Space Tower Defense?
Do Alien Evolution or Space Tower Defense have ads?
Which is updated more often, Alien Evolution or Space Tower Defense?
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