# Space Cadet Defender HD vs Galaxy Attack

The clearest difference is rating: Galaxy Attack at 5.0 against Space Cadet Defender HD's 4.4. Galaxy Attack also leads on update cadence (daily vs every 2 months). Space Cadet Defender HD's advantage is ratings volume (468 vs 4) and iOS requirement (8.0 vs 12.0). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Space Cadet Defender HD sells 6 one-off in-app purchases and Galaxy Attack sells 9 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Galaxy Attack holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: Space Cadet Defender HD has 468 ratings behind it against 4, so its average is the more settled of the two.

Space Cadet Defender HD ships an update every 2 months, Galaxy Attack daily. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Space Cadet Defender HD | Galaxy Attack |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.4 (468 ratings)](https://appshunter.io/ios/app/space-cadet-defender-hd-invaders/id513176479/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/galaxy-attack-space-invaders/id6499509018/reviews)** |
| Number of ratings | **468** | 4 |
| Positive reviews | 76.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Daily** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 28 MB | 64 MB |
| Requires iOS | **8.0** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [SixHourSoft LLC](https://appshunter.io/developer/345114619) | [Hoang Thi Na](https://appshunter.io/developer/1580512155) |

## What reviewers say

### Space Cadet Defender HD

[App page](https://appshunter.io/ios/app/space-cadet-defender-hd-invaders/id513176479)

Defend Earth from an alien invasion in this fast-paced arcade space shooter. Upgrade your ship with powerful enhancements and conquer over 150 unique levels, including challenging boss battles. Compete for high scores and save your progress.

**Highlights:** HD retina graphics, 150+ unique levels, Ship upgrades, Boss levels, Unique powerups, GameCenter high scores

**Features:** Vision Pro support

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 5000 Medals | $0.99 | one-time |
| Second Invasion | $1.99 | one-time |
| Third Invasion | $1.99 | one-time |
| 30000 Medals | $4.99 | one-time |
| 70000 Medals | $9.99 | one-time |
| 140000 Medals | $14.99 | one-time |

**What reviewers like**

- ⭐ Excellent game
- 🕹️ Fun and challenging gameplay
- 🕹️ Nostalgic old-school feel
- 🕹️ Addictive and engaging
- 💰 Good value for free game

**What reviewers complain about**

- 💰 Difficulty requires paid upgrades to progress
- 🛠️ Controls can be sluggish or unresponsive
- 🔁 Repetitive level design
- 🔁 Lack of level variety after a certain point
- 🐛 Occasional crashes or bugs

**Reported bugs**

- Crashes on certain devices
- Progression loss when resetting game
- Unresponsive controls

**Requested features**

- More levels and content
- Level selection or reset option
- Improved controls and responsiveness
- Ability to replay completed levels


### Galaxy Attack

[App page](https://appshunter.io/ios/app/galaxy-attack-space-invaders/id6499509018)

Engage in an intense space battle as a warrior defending the galaxy from alien invaders. Use your energy ball and arsenal to destroy enemy ships, collect power-ups, and defeat formidable boss vessels. Immerse yourself in mesmerizing interstellar environments and prove your skills to save the universe.

**Highlights:** Space warrior role, Energy ball weapon, Power-up collection, Boss ship battles, Interstellar environments, Level progression

**Features:** macOS Compatibility

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1000 Coins | $0.99 | one-time |
| RemoveAds | $1.99 | one-time |
| Zenmode | $1.99 | one-time |
| 3150 Coins | $2.99 | one-time |
| RemoveAds Plus | $3.99 | one-time |
| 5500 Coins | $4.99 | one-time |
| Increase MaxLives from 2 to 5 | $5.99 | one-time |
| 12000 Coins | $9.99 | one-time |
| 39000 Coins | $29.99 | one-time |


## Frequently asked questions

### Is Space Cadet Defender HD free?

Space Cadet Defender HD is free to download, with in-app purchases available.

### Is Galaxy Attack free?

Galaxy Attack is free to download, with in-app purchases available.

### Which has better reviews, Space Cadet Defender HD or Galaxy Attack?

Galaxy Attack is rated higher. Space Cadet Defender HD averages 4.4 out of 5 from 468 ratings, while Galaxy Attack averages 5.0 from 4 ratings.

### Do Space Cadet Defender HD or Galaxy Attack have ads?

Neither Space Cadet Defender HD nor Galaxy Attack shows ads.

### Which is updated more often, Space Cadet Defender HD or Galaxy Attack?

Space Cadet Defender HD ships an update every 2 months, and Galaxy Attack daily. Most recently, Space Cadet Defender HD was updated on October 23, 2026 and Galaxy Attack on October 24, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*