Comparison

Project Clean Earth vs Idle Space Force

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

Head to head
About

Project Clean Earth

Embark on a survival adventure in a retro pixel world. Cleanse a radiation-contaminated Earth of mutant creepers using "Bernard," mankind's last weapon. Enhance your abilities with a variety of weapons, drones, and artifacts to complete the Earth Clean Project.

Highlights
  • Retro pixel graphic apocalypse world
  • Sci-fi story and survival action
  • Strengthen character with weapons, drones, artifacts
  • Strategic weapon and drone combinations
  • Random artifacts and events for replayability
  • Discover mutant monster attack patterns
  • New stages and modes as you grow stronger
Features
Read full description

Rougelite + Hack'n Slash! An exciting apocalypse world view hidden in a retro pixel graphic. Sci-fi story and exciting survival action. Earth contaminated with radiation. to clean up the Earth that's left only the mutant creeper The last weapon of mankind, "Bernard," has come. Strengthen Bernard with dozens of weapons, drones, artifact items and various events! Complete the Earth Clean Project! - Strategically combine various weapons and drones, including short distance, long distance, and wide area. - Loglight Ryu's random artifacts and events are added to play new every time. - Find out the attack patterns of various and distinctive mutant monsters and target them - New stages and modes that increase as I become stronger Enjoy the new Rougelite Hack'n Slash now!

About

Idle Space Force

Command a retro spaceship in this incremental clicker game. Blast enemies, upgrade your ship, and explore planets to earn passive income. Enjoy classic shoot 'em up action with idle RPG mechanics.

Highlights
  • Incremental idle gameplay
  • Retro space shoot 'em up battles
  • Ship upgrades and prestige system
  • Offline income generation
  • Explore multiple unique worlds
  • Pixelated retro graphics
Features
Read full description

Take command of your ship in Idle Space Force! Blast your way through this retro incremental space shoot ‘em up, upgrade your ship, and travel to scenic and dangerous planets, collecting a passive income for your fleet! Idle Space Force is a retro idle tapper with the perfect blend of idle and RPG mechanics inspired by the classics like Space Invaders and Asteroids. Collect your ISF credits while offline and blast through seven unique worlds with classic shmup gameplay. Prestige your way through Deep Space upgrades and travel to never before seen worlds! Idle Gameplay Generate income as you cruise AFK or battle hordes of enemies through space! Your ship’s progress continues while offline, letting you pick up the action wherever you are in the universe. Action-Packed Battles Engage in intense pixelated retro space battles as you face relentless enemies from across the galaxy. With classic mechanics of the staple shoot ‘em up / shmup genre, you’ll be filling the screen with bombs and bees in a flash – battling enemy ships, enemy hornets, and enemy bosses. Gameplay inspired by 8 bit classics like Space Invaders and Asteroids. Upgrade Your Ship Kit out your ship with powerful upgrades and frontier technologies to unleash devastating firepower. Collect income like an idle game while offline, then add missiles, magnetism, and more to your vessel. Looking for even more firepower? Prestige your way to the ultimate unlocks and blast away the competition! Explore the Cosmos Vast worlds await you in the expanses of space. Uncover hidden treasures, acquire new upgrades and confront challenging bosses. From the outskirts of deep space to the remnants of the Terran homeworld, there are many unique challenges along the way. Addictive Experience With simple yet engaging gameplay mechanics, Idle Space Force offers endless entertainment for both casual players and hardcore enthusiasts alike. The mix of idle game mechanics and shoot 'em up action ensures that even when you’re not working – you’re always on the clock! Ready to conquer the cosmos? Download Idle Space Force now and embark on an epic retro idle shmup journey!

Screenshots

Project Clean Earth4 screens
Idle Space Force4 screens

Verdict

The call

Project Clean Earth and Idle Space Force both sit at 4.7 stars, but that hides the real split: 71% of Idle Space Force's written reviews are positive against 47% of Project Clean Earth's. Project Clean Earth's advantage is ratings volume (1.9K vs 547) and iOS requirement (15.0 vs 18). On price, rating, update cadence 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. Project Clean Earth sells 14 one-off in-app purchases and Idle Space Force sells 8 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.7 for Project Clean Earth against 4.7 for Idle Space Force. Both are backed by a comparable volume of ratings — 1.9K and 547 respectively. Written reviews are what separate them: 47% of Project Clean Earth's written reviews are positive against 71% of Idle Space Force's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on September 24, 2026 and September 22, 2026 respectively.

Scorecard3 real differences · 7 level
Project Clean Earth versus Idle Space Force: the parameters behind the verdict, then further details
ParameterProject Clean EarthIdle Space Force
PriceFreeFree
Rating4.7 (1.9K ratings)4.7 (547 ratings)
Positive reviews47.2% of reviews71.3% of reviews — better
Number of ratings1.9K — better547
Update frequencyEvery 3 weeksEvery 3 weeks
AdsYesYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.0 — better18
Further details — not scored
Size401 MB136 MB
Age rating12+9+
Developer1N1Fuse Games

Customer experience

Project Clean Earth

All ratings1,923 ratings
Positive92.2%
Neutral3.4%
Negative4.4%
Written reviews335 reviews
Positive47.2%
Neutral13.1%
Negative39.7%

Idle Space Force

All ratings547 ratings
Positive92.9%
Neutral3.1%
Negative4.0%
Written reviews80 reviews
Positive71.3%
Neutral11.3%
Negative17.5%

User reviews

Project Clean Earth

From 1.9K App Store ratings

What we love

  • 🎮 Fun gameplay
  • 👍 Addictive and enjoyable
  • 🚀 Smooth performance
  • 🎨 Great visuals and art style

Room to improve

  • 🐛 In-app purchases not working
  • 🔒 Lack of account sync between devices
  • 🤯 Difficulty spike at later levels
  • 🕰️ Excessive grinding required for progress

Idle Space Force

From 547 App Store ratings

What we love

  • 🚀 Great game with decent core loop
  • 👍 No intrusive ads and reasonable IAP
  • 🚀 Constant new updates
  • 🚀 Engaging and fun gameplay
  • 👍 No forced ads

Room to improve

  • 🐛 Inaccurate hit boxes for coins/fuel
  • 🐛 Offline earnings issues
  • 🐛 Crashes when trying to advance
  • 🐛 Bugs and glitches
  • ⏱️ Slow early game progression

Bugs and requests

Project Clean Earth

Reported bugs

3 issues
  • Purchased items not being delivered
  • Crashes and freezes on certain devices
  • Incorrect pricing and charges for in-app purchases

Requested features

4 requests
  • Multiplayer co-op mode
  • More character customization options
  • Improved balance and difficulty scaling
  • Ability to quickly use stamina on beaten levels

Idle Space Force

Reported bugs

3 issues
  • Crashes when trying to advance to next planet
  • Offline rewards not working properly
  • Forced flashing screen from power-up

Requested features

7 requests
  • Loot falling towards the ship
  • Seasonal item multipliers working on all items
  • Visibility of loot from invisible enemies
  • Hint system for clues
  • Faster bullet speed
Show 2 more
  • Earlier auto-fire/generation upgrades
  • More levels/content

In-app purchases

14 purchases

Project Clean Earth

One-time14
  • Welcome Package$2.99
  • Monthly Premium$3.99
  • Intermediate Pack$4.99
Show 11 more
  • Guerrilla Special Price$4.99
  • Ad-Free Package$5.99
  • Advanced Pack$6.99
  • Gun Package$6.99
  • Turret Package$6.99
  • Buff Package$6.99
  • Growth Fund Pack$8.99
  • Growth Fund Pack 2$8.99
  • Minerals Pack$10.99
  • Mineral Pack2$12.99
  • VIP Package3 variants$12.99
8 purchases

Idle Space Force

One-time8
  • Star Coin Currency x100$1.99
  • Star Coin Currency x300$3.99
  • Remove Ads$6.99
Show 5 more
  • Prestige Pack$7.99
  • Starter Pack$9.99
  • Star Coin Currency x1000$10.99
  • Star Coin Currency x2500$19.99
  • Star Coin Currency x7500$49.99

Questions

Is Project Clean Earth free?
Project Clean Earth is free to download, with in-app purchases available.
Is Idle Space Force free?
Idle Space Force is free to download, with in-app purchases available.
Which has better reviews, Project Clean Earth or Idle Space Force?
Project Clean Earth and Idle Space Force are both rated 4.7 out of 5 on the App Store, from 1.9K and 547 ratings respectively.
Do Project Clean Earth or Idle Space Force have ads?
Both Project Clean Earth and Idle Space Force show ads.
Which is updated more often, Project Clean Earth or Idle Space Force?
Project Clean Earth ships an update every 3 weeks, and Idle Space Force every 3 weeks. Most recently, Project Clean Earth was updated on September 24, 2026 and Idle Space Force on September 22, 2026.

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