# Space Cadet Defender HD vs Galaxy Invaders

The clearest difference is ads: Space Cadet Defender HD at none against Galaxy Invaders's shown. Space Cadet Defender HD also leads on review sentiment (76% vs 47%) and ratings volume (468 vs 56). Galaxy Invaders's advantage is update cadence (every 2 weeks vs every 2 months). On price, rating, 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 Invaders sells 27 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Space Cadet Defender HD holds the better App Store score, 4.4 against 4.2. That said, the two scores are not equally well evidenced: Space Cadet Defender HD has 468 ratings behind it against 56, so its average is the more settled of the two. Written reviews point the same way: 76% of Space Cadet Defender HD's written reviews are positive against 47% of Galaxy Invaders's.

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

## The numbers

| Metric | Space Cadet Defender HD | Galaxy Invaders |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (468 ratings)](https://appshunter.io/ios/app/space-cadet-defender-hd-invaders/id513176479/reviews)** | [4.2 (56 ratings)](https://appshunter.io/ios/app/galaxy-invaders-space-attack/id6443981789/reviews) |
| Number of ratings | **468** | 56 |
| Positive reviews | **76.0% of reviews** | 47.4% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 28 MB | 169 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 9+ |
| Developer | [SixHourSoft LLC](https://appshunter.io/developer/345114619) | [PUMPKIN VN CO., LTD](https://appshunter.io/developer/1579553595) |

## 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 Invaders

[App page](https://appshunter.io/ios/app/galaxy-invaders-space-attack/id6443981789)

Engage in an ultimate space shooting game with classic arcade style and modern expression. Explore galaxies, battle alien invaders with advanced weaponry, and collect powerful spaceships and drones. Enjoy offline play and compete with others globally.

**Highlights:** Classic arcade space shooting gameplay, Multiplayer modes (1v1, 1v3, 2v2, survival), PVP online and co-op missions, Variety of enemies and challenging bosses, Collect 15 spaceships and 12 drones, Unlock legendary ships with superpowers, Offline playable

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (27)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SHIP PART 1 | $0.99 | one-time |
| Crystal 1 | $1.99 | one-time |
| Revive Crystal | $1.99 | one-time |
| SHIP PART 2 | $1.99 | one-time |
| Powerball Ticket 1 | $1.99 | one-time |
| Boosters Pack | $2.99 | one-time |
| Gold Pack | $2.99 | one-time |
| PIGGY BANK 1 | $2.99 | one-time |
| Starter Pack | $2.99 | one-time |
| Reflex and Swarm Pack | $2.99 | one-time |
| SHIP PART 4 | $3.99 | one-time |
| Crystal 2 | $4.99 | one-time |
| Subscription Basic | $4.99 | one-time |
| WING 5 | $4.99 | one-time |
| SMALL EVENT PACK | $4.99 | one-time |
| PIGGY BANK 2 | $4.99 | one-time |
| SKIN 5 | $4.99 | one-time |
| Weapon Variant 5 | $4.99 | one-time |
| PIGGY BANK 3 | $8.99 | one-time |
| Reinforcement Pack | $8.99 | one-time |
| Powerball Ticket 3 | $9.99 | one-time |
| Crystal 3 | $9.99 | one-time |
| BIG EVENT PACK | $17.99 | one-time |
| Subscription Elite | $17.99 | one-time |
| SALE 50% OFF | $17.99 | one-time |
| Crystal 4 | $19.99 | one-time |
| Crystal 5 | $42.99 | 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 Invaders free?

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

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

Space Cadet Defender HD is rated higher. Space Cadet Defender HD averages 4.4 out of 5 from 468 ratings, while Galaxy Invaders averages 4.2 from 56 ratings.

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

Galaxy Invaders shows ads; Space Cadet Defender HD does not.

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

Space Cadet Defender HD ships an update every 2 months, and Galaxy Invaders every 2 weeks. Most recently, Space Cadet Defender HD was updated on October 23, 2026 and Galaxy Invaders 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.*