Comparison

Slime Evolution vs True Happiness

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

Head to head
About

Slime Evolution

Cultivate a charming slime farm by merging identical slimes to discover new ones. Assign elemental properties like water, fire, or grass to influence their characteristics. Embark on adventures to collect more slimes and treasures, and document your discoveries in a field guide.

Highlights
  • Create new slimes by merging
  • Assign elemental properties (water, fire, grass)
  • Go on adventures for rewards
  • Collect slimes in a field guide
  • Discover unique slime evolution methods
Features
Read full description

Raise cute little slime and take care of a slime farm of your own! [‘How to enjoy 'Slime Evolution'!] 1. Create a new slime – combine the same slime and a new slime appears. 2. Set an element of the slime – slime can have water / fire / or grass elements. Each element has different characteristics, so choose wisely! 3. go on an advanture with your Slime. – You can get a slime and jewery during the advanture. 4. Check your field guide book – You can cehck the name of slimes with funny explanation and their ability. 5. Make a special Slime – Try to make a special slime by finding a new way other than existing evolution method. Thank you :)

About

True Happiness

Embark on a journey through vibrant worlds with simple touch controls. Collect coins, avoid enemies, and unlock unique poses. Decorate your personal space with collected items and enjoy playful music. This game aims to provide a stress-relieving and feel-good experience.

Highlights
  • Easy touch controls
  • Colorful meditation stages
  • Unlockable poses
  • Stress-relieving living space
  • Interior shop for customization
  • Playful background music
Read full description

When I close my eyes I am flying through the sky. Is this a dream? Calm blue sky, strange outer space, frightening nightmares, pudding-filled heavens... Use simple touch controls to avoid enemies, collect coins, and traverse exciting worlds! As you do so, unlock many different poses! When tired of meditating rest in your own special place. Decorate it with strange objects, and make it your own! Buy stuff with the coins you collected and become even happier! Fly through the sky, fight, travel far and away. Where on earth is "True Happiness"? Let's meditate together! Features - Easy touch controls - Colorful meditation stages - Funny poses - Stress relieving living space - Feel-good interior shop - Playful background music - Bonus stage full of coins Will you find "True Happiness"? ※ "True Happiness" is a game app. The extent to which you experience happiness by playing differs per person. The app does not guarantee that every person finds true happiness.

Screenshots

Slime Evolution4 screens
True Happiness4 screens

Verdict

The call

The clearest difference is in-app purchases: True Happiness at none against Slime Evolution's 4. Slime Evolution's advantage is update cadence (every 2 months vs every 12 months) and review sentiment (91% vs 69%). On price, rating, ratings volume and ads 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. Slime Evolution sells 4 one-off in-app purchases. True Happiness asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.8 for Slime Evolution against 4.9 for True Happiness. Both are backed by a comparable volume of ratings — 598 and 241 respectively. Written reviews are what separate them: 91% of Slime Evolution's written reviews are positive against 69% of True Happiness's.

UpkeepUpdate frequency

Slime Evolution ships an update every 2 months, True Happiness every 12 months. The most recent releases landed on November 6, 2026 and November 7, 2026 respectively.

Scorecard5 real differences · 5 level
Slime Evolution versus True Happiness: the parameters behind the verdict, then further details
ParameterSlime EvolutionTrue Happiness
PriceFreeFree
Rating4.8 (598 ratings)4.9 (241 ratings) — better
Positive reviews91.2% of reviews — better69.0% of reviews
Number of ratings598 — better241
Update frequencyEvery 2 months — betterEvery 12 months
AdsYesYes
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesAd-supported — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.0 — better15.0
Further details — not scored
Size111 MB169 MB
Age rating4+9+
DeveloperSeHyeon Imponos corporation

Customer experience

Slime Evolution

All ratings597 ratings
Positive95.5%
Neutral3.2%
Negative1.3%
Written reviews260 reviews
Positive91.2%
Neutral5.0%
Negative3.8%

True Happiness

All ratings239 ratings
Positive97.1%
Neutral1.3%
Negative1.7%
Written reviews84 reviews
Positive69.0%
Neutral4.8%
Negative26.2%

User reviews

Slime Evolution

From 598 App Store ratings

What we love

  • 👍 Cute and relaxing game
  • 🎨 Charming art style
  • 🕹️ Simple and addictive gameplay
  • ⏱️ Good time-killer
  • 🌳 Enjoyable exploration and evolution

Room to improve

  • 🐛 Occasional bugs and glitches
  • 💰 Unbalanced upgrade costs between platforms
  • 🔍 Unclear mechanics (e.g. using seeds)
  • 🌐 Language/localization issues

True Happiness

From 241 App Store ratings

What we love

  • 😌 Makes users happy
  • 👍 Deep gameplay and story
  • 😄 Unique and strange gameplay
  • 😂 Makes users laugh
  • 🧘 Calming and relaxing experience

Room to improve

  • ⚠️ Too many ads
  • 😵 Frustrating ads
  • ❌ Ads impede enjoyment
  • ❓ Unclear objectives
  • 😩 Repetitive gameplay

Bugs and requests

Slime Evolution

Reported bugs

3 issues
  • Inability to merge certain slime types
  • Disappearing slimes and lost progress
  • Ads not working or causing errors

Requested features

5 requests
  • Add more types of slimes
  • Implement a slime shop/store
  • Improve the reward system
  • Add more gameplay modes or mini-games
  • Enhance the exploration and progression systems

True Happiness

Reported bugs

10 issues
  • 🐛 App crashes on startup
  • 🐛 App does not open
  • 🐛 App closes immediately after launch
  • 🐛 App crashes when opening
  • 🐛 App crashes after starting
Show 5 more
  • 🐛 App crashes on iPhone 6
  • 🐛 Ads not dismissible
  • 🐛 Game lags excessively
  • 🐛 App crashes on launch
  • 🐛 App doesn't start

Requested features

3 requests
  • Option to remove ads via in-app purchase
  • Integration with Battle Cats
  • More mission variety

In-app purchases

4 purchases

Slime Evolution

One-time4
  • 20 Gem$0.99
  • 110 Gem$4.99
  • 240 Gem$9.99
Show 1 more
  • 1400 Gem$49.99
None

True Happiness

No in-app purchases

Questions

Is Slime Evolution free?
Slime Evolution is free to download, with in-app purchases available.
Is True Happiness free?
True Happiness is free to download, with no in-app purchases.
Which has better reviews, Slime Evolution or True Happiness?
True Happiness is rated higher. Slime Evolution averages 4.8 out of 5 from 598 ratings, while True Happiness averages 4.9 from 241 ratings.
Do Slime Evolution or True Happiness have ads?
Both Slime Evolution and True Happiness show ads.
Which is updated more often, Slime Evolution or True Happiness?
Slime Evolution ships an update every 2 months, and True Happiness every 12 months. Most recently, Slime Evolution was updated on November 6, 2026 and True Happiness on November 7, 2026.

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