Space Tower vs Backpack Merge
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Space Tower
Command a galactic defense to protect your space tower from alien invaders. Strategically upgrade your tower's abilities and weapons to withstand relentless waves of enemies and defeat powerful bosses. Enjoy idle gameplay with ample rewards, even while offline.
- Idle tower defense gameplay
- Strategic tower defense
- Upgrade basic abilities
- Activate powerful weapons
- Unlock and improve tech abilities
- Defend against alien attacks
- Battle mighty bosses
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This is a tower defense battle in the galaxy, and you’ve been appointed to be the commander. Choose upgrades and use your strategy to make it an indestructible tower. To defend against aliens’ attacks is your final goal! What you can do: -Upgrade the strength of basic abilities -Activate and develop powerful weapons -Upgrade techs to unlock and improve abilities Game Features: -Idle tower defense gameplay -Defend the space tower with strategy -Mighty bosses await you in each galaxy chapter -Lots of rewards, even when you take a cruise Attack wave after wave of space aliens, defend the tower from mighty bosses and achieve the final success in this idle space TD battle! Let’s start this space adventure, my commander!
Backpack Merge
Merge magical equipment and strategically organize your backpack to defend a peaceful academy from a monster invasion. Become the legendary Archmage and discover diverse combat strategies through talented equipment combinations.
- Merge equipment
- Organize backpack
- Defend from monsters
- Diverse strategies
- Talented equipment combinations
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The Peaceful Magic Academy is suddenly under monsters' invasion! Become the legendary Archmage, merge your equipment, and organize your backpack! Help the Magic Academy fend off the monsters' invasion! Game Features: -Merge equipment and organize your backpack! -Defend the Magic Academy from monster attacks! -Talented equipment combinations offer diverse strategies! Contact us: hecs@droidhang.com
Screenshots
Verdict
The clearest difference is ads: Backpack Merge at none against Space Tower's shown. Space Tower's advantage is rating (4.8 vs 4.4) and review sentiment (40% vs 25%). On price, update cadence, 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. Space Tower sells 21 one-off in-app purchases and Backpack Merge sells 44 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
Space Tower holds the better App Store score, 4.8 against 4.4. Both are backed by a comparable volume of ratings — 571 and 119 respectively. Written reviews point the same way: 40% of Space Tower's written reviews are positive against 25% of Backpack Merge's.
Space Tower ships an update every 5 weeks, Backpack Merge every 6 weeks. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.
| Parameter | Space Tower | Backpack Merge |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (571 ratings) — better | 4.4 (119 ratings) |
| Positive reviews | 40.0% of reviews — better | 25.4% of reviews |
| Number of ratings | 571 — better | 119 |
| Update frequency | Every 5 weeks — better | Every 6 weeks |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 190 MB | 231 MB |
| Age rating | 4+ | 9+ |
| Developer | CYBERJOY LIMITED | 伟 王 |
Customer experience
Space Tower
Backpack Merge
User reviews
Space Tower
From 571 App Store ratingsWhat we love
- 🎮 Engaging and addictive gameplay mechanics
- ⬆️ Extensive upgrade and progression systems
- 🎨 Visually appealing design
- ⏱️ Good for casual play between other activities
Room to improve
- 💰 Aggressive monetization and pay-to-win mechanics
- ⚡ Energy system limits gameplay
- 🐛 Data synchronization failures across devices
- 🔄 Repetitive grinding required
- ⏳ Excessively long research/upgrade timers
Backpack Merge
From 119 App Store ratingsWhat we love
- 🎮 Engaging and addictive gameplay mechanics
- 🎨 Attractive art style and visual design
- 🧠 Strategic depth with resource management
- ⚡ Active developer support with regular patches
- 🎯 Unique backpack/inventory management concept
Room to improve
- 📺 Excessive ad frequency and duration (90+ seconds)
- 💰 Extremely high monetization and pay-to-win mechanics
- 🐛 Frequent server connection errors and crashes
- ⚠️ Ads frequently fail to load properly
- ⚖️ Severe game balance issues (weak weapons, overpowered enemies)
Bugs and requests
Space Tower
Reported bugs
7 issues- Game freezes and fails to load progress data
- Data not syncing between devices with same Apple ID
- Ad-free purchases requiring repurchase on new devices
- Tournament upgrade buffs not applying correctly
- Research timer displaying incorrect duration (30 minutes showing as 31 hours)
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- Music not working
- Unable to access previously completed challenge levels
Requested features
6 requests- More game levels
- Additional weapons and enemy variety
- Restore previously available game formats (Galaxy Background, Flaming Eye)
- Remove or reduce energy system
- Improve gold generation rates
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- More interactive gameplay features
Backpack Merge
Reported bugs
11 issues- Ads fail to load or display (critical issue affecting rewards)
- Server connection errors and timeouts
- Insufficient items equipped error blocking stage progression
- Stamina randomly drains after server errors
- Login failures with Facebook and Apple ID
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- Invisible mob enemies causing infinite waves
- Game crashes and freezes
- Ads stuck in loading state indefinitely
- Rewards not properly granted after watching ads on tablets
- Performance lag during boss fights
- Game won't open or load properly
Requested features
7 requests- Add German language support
- Add Ukrainian and Russian language options
- Add Google ID login option for iOS
- Reduce ad frequency and duration
- Implement alternative monetization model
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- Fix ad loading system
- Improve server stability
In-app purchases
Space Tower
- Newbie Pack$2.99
- Chapter Pack$2.99
- Special Pack 1$2.99
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- Tournament Pack 1$2.99
- Pouch Of Diamonds$4.99
- Chapter Pack$4.99
- Special Pack 2$4.99
- Piggy Bank$4.99
- Tournament Pack 2$4.99
- VIP Pack$9.99
- Chapter Pack 3$9.99
- Special Pack 3$9.99
- Month Card$9.99
- Tournament Pack 3$9.99
- Original Price Price 10.99$10.99
- Resource Pack$14.99
- Original Price Price 17.99$17.99
- Special Pack 4$19.99
- Tournament Pack 4$19.99
- Premium Resource Pack$29.99
- Original Price Price 79.99$79.99
Backpack Merge
- Package47$0.99
- Some Gems$0.99
- Package65$0.99
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- Package54$0.99
- Package61$0.99
- Package33$0.99
- Package40$0.99
- Package26$0.99
- Package9$0.99
- Package11$0.99
- Package27$1.99
- Package71$4.99
- Package72$4.99
- Package144$4.99
- Package141$4.99
- A small pile of gems$4.99
- Package7$4.99
- Package12$4.99
- Package28$4.99
- Package35$4.99
- Package21$4.99
- Package76$6.99
- Package80$7.99
- Package81$7.99
- Package86$8.99
- Package84$8.99
- Package181$9.99
- Package90$9.99
- Package43$9.99
- Package50$9.99
- Package14$9.99
- Package36$9.99
- A large pile of gems$9.99
- Package22$9.99
- Package8$9.99
- Package10$9.99
- Package13$9.99
- Package204$14.99
- Package102$15.99
- Package103$15.99
- Package23$19.99
- A bag of gems$19.99
- Package44$19.99
- Package24$49.99
Questions
Is Space Tower free?
Is Backpack Merge free?
Which has better reviews, Space Tower or Backpack Merge?
Do Space Tower or Backpack Merge have ads?
Which is updated more often, Space Tower or Backpack Merge?
Other comparisons
